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• TempData Error in ASP .NET MVC2

  - by Mauro

  Hi, I'm looking for a description of the reasons why this error is generated and what are the possible fixes to it. In my ASP.NET MVC2 controller I just added a TempData data passing. Server Error in '/' Application. The SessionStateTempDataProvider class requires session state to be enabled. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: The SessionStateTempDataProvider class requires session state to be enabled.

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• jQuery unbinding click event when maximum number of children are displayed

  - by RyanP13

  I have a personal details form that alows you to enter a certain number of dependants which is determined by the JSP application. The first dependant is visible and the user has the option to add dependants up to the maximum number. All other dependants are hidden by default and are displayed when a user clicks the 'Add another dependant button'. When the maximum number of dependants has been reached the button is greyed out and a message is generated via jQuery and displayed to tell the user exactly this. The issue i am having is when the maximum number of dependants has been reached the message is displayed but then the user can click the button to add more dependants and the message keeps on generating. I thought unbinding the click event would sort this but it seems to still be able to generate a second message. Here is the function i wrote to generate the message: // Dependant message function function maxDependMsg(msgElement) { // number of children can change per product, needs to be dynamic // count number of dependants in HTML var $dependLength = $("div.dependant").length; // add class maxAdd to grey out Button // create maximum dependants message and display, will not be created if JS turned off $(msgElement) .addClass("maxAdd") .after($('<p>') .addClass("maxMsg") .append("The selected web policy does not offer cover for more than " + $dependLength + " children, please contact our customer advisers if you wish discuss alternative policies available.")); } There is a hyperlink with a click event attached like so: $("a.add").click(function(){ // Show the next hidden table on clicking add child button $(this).closest('form').find('div.dependant:hidden:first').show(); // Get the number of hidden tables var $hiddenChildren = $('div.dependant:hidden').length; if ($hiddenChildren == 0) { // save visible state of system message $.cookies.set('cpqbMaxDependantMsg', 'visible'); // show system message that you can't add anymore dependants than what is on page maxDependMsg("a.add"); $(this).unbind("click"); } // set a cookie for the visible state of all child tables $('div.dependant').each(function(){ var $childCount = $(this).index('div.dependant'); if ($(this).is(':visible')) { $.cookies.set('cpqbTableStatus' + $childCount, 'visible'); } else { $.cookies.set('cpqbTableStatus' + $childCount, 'hidden'); } }); return false; }); All of the cookies code is for state saving when users are going back and forward through the process.

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• Schema compare with MS Data Tools in VS2008

  - by rdkleine

  When performing a schema compare having db_owner rights on the target database results in the following error: The user does not have permission to perform this action. Using the SQL Server Profiler I figured out this error occurs executing a query targeting the master db view: [sys].[dm_database_encryption_keys] While specifically ignoring all object types but Tables one would presume the SQL Compare doesn't need access to the db encryption keys. Also note: http://social.msdn.microsoft.com/Forums/en-US/vstsdb/thread/c11a5f8a-b9cc-454f-ba77-e1c69141d64b/ One solution would be to GRANT VIEW SERVER STATE to the db user, but in my case I'm not hosting the database services and won't get the rights to the server state. Also tried excluding DatabaseEncryptionKey element in the compare file. <PropertyElementName> <Name>Microsoft.Data.Schema.Sql.SchemaModel.SqlServer.ISql100DatabaseEncryptionKey</Name> <Value>ExcludedType</Value> </PropertyElementName> Anyone has an workaround this?

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• Sharepoint (active directory account creation mode) - Using STSADM

  - by vivek m

  This question is regarding using STSADM command to create new site collection in Active Directory Account creation mode. My setup is like this- I have 2 virtual PCs in a Windows XP Pro SP3 host. Both VPCs are Windows Server 2003 R2. One VPC acts as the DC, DNS Server, DHCP server, has Active Directory installed and is also the Database Server. The other VPC is the domain member and it is the IIS web server, POP/SMTP server and it has WSS 3.0 installed. I created a new site using the GUI in Central Admin page. For creating a site collection under the newly created site, I needed to use the STSADM command line tool since it cannot be done from Central Admin page in Active Directory Account creation mode. Thats where i got into a problem- stsadm.exe -o createsite -url http://vivek-c5ba48dca:1111/sites/Sales -owneremail [email protected] -sitetemplate STS#1 The format of the specified domain name is invalid. (Exception from HRESULT: 0x800704BC) The following is the output from the SHarepoint LOG- * stsadm: Running createsite 9e7d Medium Initializing the configuration database connection. 95kp High Creating site http://vivek-c5ba48dca:1111/sites/Sales in content database WSS_Content_Sharepoint_1111 95kq High Creating top level site at http://vivek-c5ba48dca:1111/sites/Sales 72jz Medium Creating site: URL "/sites/Sales" 72e1 High Unable to get domain DNS or forest DNS for domain sharepointsvc.com. ErrorCode=1212 8jvc Warning #1e0046: Adding user "spsalespadmin" to OU "sharepoint_ou" in domain "sharepointsvc.com" FAILED with HRESULT -2147023684. 72k1 High Cannot create site: "http://vivek-c5ba48dca:1111/sites/Sales" for owner "@\@", Error: , 0x800704bc 8e2s Medium Unknown SPRequest error occurred. More information: 0x800704bc 95ks Critical The site /sites/Sales could not be created. The following exception occured: The format of the specified domain name is invalid. (Exception from HRESULT: 0x800704BC). 72ju High stsadm: The format of the specified domain name is invalid. (Exception from HRESULT: 0x800704BC) Callstack: at Microsoft.SharePoint.Library.SPRequest.CreateSite(Guid gApplicationId, String bstrUrl, Int32 lZone, Guid gSiteId, Guid gDatabaseId, String bstrDatabaseServer, String bstrDatabaseName, String bstrDatabaseUsername, String bstrDatabasePassword, String bstrTitle, String bstrDescription, UInt32 nLCID, String bstrWebTemplate, String bstrOwnerLogin, String bstrOwnerUserKey, String bstrOwnerName, String bstrOwnerEmail, String bstrSecondaryContactLogin, String bstrSecondaryContactUserKey, String bstrSecondaryContactName, String bstrSecondaryContactEmail, Boolean bADAccountMode, Boolean bHostHeaderIsSiteName) at Microsoft.SharePoint.Administration.SPSiteCollection.Add(SPContentDataba... 72ju High ...se database, String siteUrl, String title, String description, UInt32 nLCID, String webTemplate, String ownerLogin, String ownerName, String ownerEmail, String secondaryContactLogin, String secondaryContactName, String secondaryContactEmail, String quotaTemplate, String sscRootWebUrl, Boolean useHostHeaderAsSiteName) at Microsoft.SharePoint.Administration.SPSiteCollection.Add(String siteUrl, String title, String description, UInt32 nLCID, String webTemplate, String ownerLogin, String ownerName, String ownerEmail, String secondaryContactLogin, String secondaryContactName, String secondaryContactEmail, Boolean useHostHeaderAsSiteName) at Microsoft.SharePoint.StsAdmin.SPCreateSite.Run(StringDictionary keyValues) at Microsoft.SharePoint.StsAdmin.SPStsAdmin.RunOperation(SPGlobalAdmi... 72ju High ...n globalAdmin, String strOperation, StringDictionary keyValues, SPParamCollection pars) 8wsw High Now terminating ULS (STSADM.EXE, onetnative.dll) * Seems to me that the trouble started with this - Unable to get domain DNS or forest DNS for domain sharepointsvc.com. ErrorCode=1212 Network connection to the sharepointsvc.com domain seems to be fine. C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\BIN>stsadm -o getproperty -pn ADAccountDomain <Property Exist="Yes" Value="sharepointsvc.com" /> C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\BIN>stsadm -o getproperty -pn ADAccountOU <Property Exist="Yes" Value="sharepoint_ou" /> C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\BIN>nslookup sharepointsvc.com Server: vm-winsrvr2003.sharepointsvc.com Address: 192.168.0.5 Name: sharepointsvc.com Addresses: 192.168.0.21, 192.168.0.5 Is there any way of checking the domain connection from within Sharepoint (like using some getproperty of the STSADM tool) Does anyone have any clue about this ? (any pointers would be very helpful) Thanks.

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• Windows Server Appfabric

  - by yuben

  I am considering using Windows Server Appfabric for it caching functionality. I have an existing classic ASP application that I want to rewrite in ASP.NET MVC. However, I want to be able to do this "piecemeal" i.e. a few pages at a time. The problem is session state between the ASP and ASP.Net MVC application. I could use a database but I would like to use Appfabric since it has good scalabilty, admin, etc. My question is: does the Appfabric caching service/functionality have an API that I could wrap in .Net and expose to my classic ASP application as a com object? I could then change all the Session and Application caching in the classic application to use the com object i.e. Appfabric. In this way I can share session state between ASP.Net MVC and classic ASP. I will have to test the performance penalty associated with interop as well.

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• Synchronization requirements for FileStream.(Begin/End)(Read/Write)

  - by Doug McClean

  Is the following pattern of multi-threaded calls acceptable to a .Net FileStream? Several threads calling a method like this: ulong offset = whatever; // different for each thread byte[] buffer = new byte[8192]; object state = someState; // unique for each call, hence also for each thread lock(theFile) { theFile.Seek(whatever, SeekOrigin.Begin); IAsyncResult result = theFile.BeginRead(buffer, 0, 8192, AcceptResults, state); } if(result.CompletedSynchronously) { // is it required for us to call AcceptResults ourselves in this case? // or did BeginRead already call it for us, on this thread or another? } Where AcceptResults is: void AcceptResults(IAsyncResult result) { lock(theFile) { int bytesRead = theFile.EndRead(result); // if we guarantee that the offset of the original call was at least 8192 bytes from // the end of the file, and thus all 8192 bytes exist, can the FileStream read still // actually read fewer bytes than that? // either: if(bytesRead != 8192) { Panic("Page read borked"); } // or: // issue a new call to begin read, moving the offsets into the FileStream and // the buffer, and decreasing the requested size of the read to whatever remains of the buffer } } I'm confused because the documentation seems unclear to me. For example, the FileStream class says: Any public static members of this type are thread safe. Any instance members are not guaranteed to be thread safe. But the documentation for BeginRead seems to contemplate having multiple read requests in flight: Multiple simultaneous asynchronous requests render the request completion order uncertain. Are multiple reads permitted to be in flight or not? Writes? Is this the appropriate way to secure the location of the Position of the stream between the call to Seek and the call to BeginRead? Or does that lock need to be held all the way to EndRead, hence only one read or write in flight at a time? I understand that the callback will occur on a different thread, and my handling of state, buffer handle that in a way that would permit multiple in flight reads. Further, does anyone know where in the documentation to find the answers to these questions? Or an article written by someone in the know? I've been searching and can't find anything. Relevant documentation: FileStream class Seek method BeginRead method EndRead IAsyncResult interface

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• Yahoo flagging mail as spam when using relay server

  - by modulaaron

  I'm using Postfix to relay mail from my site to my mail server. Mail is received properly at my Gmail and Hotmail accounts - only Yahoo is the problem. The Yahoo mail headers state: Received-SPF: none (mta1133.mail.mud.yahoo.com: domain of [email protected] does not designate permitted sender hosts) In contrast, the Gmail headers state: Received-SPF: pass (google.com: domain of [email protected] designates 74.50.xxx.xxx as permitted sender) client-ip=74.50.xxx.xxx; Reverse DNS is set up correctly, as is my SPF record. Does anyone have any suggestions as to what I can do to solve the Yahoo problem (short of contacting Yahoo, as this is a brand new mail server)? FYI - I just set up domainkeys, but I'm not sure whether they should be on the origin or relay server. Thanks

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• C++ virtual functions.Problem with vtable

  - by adivasile

  I'm doing a little project in C++ and I've come into some problems regarding virtual functions. I have a base class with some virtual functions: #ifndef COLLISIONSHAPE_H_ #define COLLISIONSHAPE_H_ namespace domino { class CollisionShape : public DominoItem { public: // CONSTRUCTOR //------------------------------------------------- // SETTERS //------------------------------------------------- // GETTERS //------------------------------------------------- virtual void GetRadius() = 0; virtual void GetPosition() = 0; virtual void GetGrowth(CollisionShape* other) = 0; virtual void GetSceneNode(); // OTHER //------------------------------------------------- virtual bool overlaps(CollisionShape* shape) = 0; }; } #endif /* COLLISIONSHAPE_H_ */ and a SphereShape class which extends CollisionShape and implements the methods above /* SphereShape.h */ #ifndef SPHERESHAPE_H_ #define SPHERESHAPE_H_ #include "CollisionShape.h" namespace domino { class SphereShape : public CollisionShape { public: // CONSTRUCTOR //------------------------------------------------- SphereShape(); SphereShape(CollisionShape* shape1, CollisionShape* shape2); // DESTRUCTOR //------------------------------------------------- ~SphereShape(); // SETTERS //------------------------------------------------- void SetPosition(); void SetRadius(); // GETTERS //------------------------------------------------- cl_float GetRadius(); cl_float3 GetPosition(); SceneNode* GetSceneNode(); cl_float GetGrowth(CollisionShape* other); // OTHER //------------------------------------------------- bool overlaps(CollisionShape* shape); }; } #endif /* SPHERESHAPE_H_ */ and the .cpp file: /*SphereShape.cpp*/ #include "SphereShape.h" #define max(a,b) (a>b?a:b) namespace domino { // CONSTRUCTOR //------------------------------------------------- SphereShape::SphereShape(CollisionShape* shape1, CollisionShape* shape2) { } // DESTRUCTOR //------------------------------------------------- SphereShape::~SphereShape() { } // SETTERS //------------------------------------------------- void SphereShape::SetPosition() { } void SphereShape::SetRadius() { } // GETTERS //------------------------------------------------- void SphereShape::GetRadius() { } void SphereShape::GetPosition() { } void SphereShape::GetSceneNode() { } void SphereShape::GetGrowth(CollisionShape* other) { } // OTHER //------------------------------------------------- bool SphereShape::overlaps(CollisionShape* shape) { return true; } } These classes, along some other get compiled into a shared library. Building libdomino.so g++ -m32 -lpthread -ldl -L/usr/X11R6/lib -lglut -lGLU -lGL -shared -lSDKUtil -lglut -lGLEW -lOpenCL -L/home/adrian/AMD-APP-SDK-v2.4-lnx32/lib/x86 -L/home/adrian/AMD-APP-SDK-v2.4-lnx32/TempSDKUtil/lib/x86 -L"/home/adrian/AMD-APP-SDK-v2.4-lnx32/lib/x86" -lSDKUtil -lglut -lGLEW -lOpenCL -o build/debug/x86/libdomino.so build/debug/x86//Material.o build/debug/x86//Body.o build/debug/x86//SphereShape.o build/debug/x86//World.o build/debug/x86//Engine.o build/debug/x86//BVHNode.o When I compile the code that uses this library I get the following error: ../../../lib/x86//libdomino.so: undefined reference to `vtable for domino::CollisionShape' ../../../lib/x86//libdomino.so: undefined reference to `typeinfo for domino::CollisionShape' Command used to compile the demo that uses the library: g++ -o build/debug/x86/startdemo build/debug/x86//CMesh.o build/debug/x86//CSceneNode.o build/debug/x86//OFF.o build/debug/x86//Light.o build/debug/x86//main.o build/debug/x86//Camera.o -m32 -lpthread -ldl -L/usr/X11R6/lib -lglut -lGLU -lGL -lSDKUtil -lglut -lGLEW -ldomino -lSDKUtil -lOpenCL -L/home/adrian/AMD-APP-SDK-v2.4-lnx32/lib/x86 -L/home/adrian/AMD-APP-SDK-v2.4-lnx32/TempSDKUtil/lib/x86 -L../../../lib/x86/ -L"/home/adrian/AMD-APP-SDK-v2.4-lnx32/lib/x86" (the -ldomino flag) And when I run the demo, I manually tell it about the library: LD_LIBRARY_PATH=../../lib/x86/:$AMDAPPSDKROOT/lib/x86:$LD_LIBRARY_PATH bin/x86/startdemo After reading a bit about virtual functions and virtual tables I understood that virtual tables are handled by the compiler and I shouldn't worry about it, so I'm a little bit confused on how to handle this issue. I'm using gcc version 4.6.0 20110530 (Red Hat 4.6.0-9) (GCC) Later edit: I'm really sorry, but I wrote the code by hand directly here. I have defined the return types in the code. I apologize to the 2 people that answered below. I have to mention that I am a beginner at using more complex project layouts in C++.By this I mean more complex makefiles, shared libraries, stuff like that.

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• Returning to last viewed List page after insert/edit with ASP.NET Dynamic Data

  - by Pat James

  With a pretty standard Dynamic Data site, when the user edits or inserts a new item and saves, the page does a Response.Redirect(table.ListActionPath), which takes the user back to page 1 of the table. If they were editing an item on page 10 (or whatever) and want to edit the next item on that page, they have to remember the page number and navigate back to it. What's the best way to return the user to the list page they last viewed? I can conceive of some solutions using cookies, session state, or query string values to retain this state and making my own Page Template to incorporate it, but I can't help thinking this must be something that was considered when Dynamic Data was created, and there must be something simpler or built-in to the framework that I'm missing here.

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• Flex BarChart and XML

  - by theband

  <mx:BarChart id="barChart" showDataTips="true" dataProvider="{testInfo}" width="100%" height="100%"> <mx:verticalAxis> <mx:CategoryAxis categoryField="ProjectName"/> </mx:verticalAxis> <mx:series> <mx:BarSeries id="barSeries" yField="ProjectName" xField="State" displayName="State" /> </mx:series> </mx:BarChart> I get the Project Names in the y -Axis, but nothing is displayed in the Chart. Could not construe on what's going as wrong. private function xmlHandler(evt:ResultEvent):void{ testInfo = evt.result.Project; }

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• Display issue with jQuery dialog: form shows as separate window

  - by RememberME

  On my button click, the jQuery dialog appears with just the title and buttons. When you mouseover, then you see the form inputs in front of the dialog covering the buttons. When you scroll down, the form inputs do not move, so you can never see the last few textboxes. <div id="popupCreateCompany" title="Create a new company"> <form> <fieldset> <p> <label for="company_name">Company Name:</label> <%= Html.TextBox("company_name") %> </p> <p> <label for="company_desc">Company Description:</label> <%= Html.TextBox("company_desc") %> </p> <p> <label for="address">Address:</label> <%= Html.TextBox("address") %> </p> <p> <label for="city">City:</label> <%= Html.TextBox("city") %> </p> <p> <label for="state">State:</label> <%= Html.TextBox("state") %> </p> <p> <label for="zip">Zip:</label> <%= Html.TextBox("zip") %> </p> <p> <label for="website">Website:</label> <%= Html.TextBox("website") %> </p> </fieldset> </form> </div> jQuery: <script type="text/javascript"> $(document).ready(function() { $('input').filter('.datepick').datepicker(); $('#popupCreateCompany').dialog( { autoOpen: false, modal: true, buttons: { 'Add': function() { var dialog = $(this); var form = dialog.find('input:text'); $.post('/company/create', $(form).serialize(), function() { dialog.dialog('close'); }) }, 'Cancel': function() { $(this).dialog('close'); } } }); $("#create-company").click(function() { $('#popupCreateCompany').dialog('open'); }); On mouseover: After scroll down:

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• Get-WMIObject fails when run AsJob

  - by codepoke

  It's a simple question, but it's stumped me. $cred = Get-Credential $jobs = @() $jobs += Get-WmiObject ` -Authentication 6 ` -ComputerName 'serverName' ` -Query 'Select * From IISWebServerSetting' ` -Namespace 'root/microsoftiisv2' ` -EnableAllPrivileges ` -Credential $cred ` -Impersonation 4 ` -AsJob $joblist = Wait-Job -Job $jobs -Timeout 60 foreach ($job in $jobs) { if ($job.State -eq "Completed") { $app = Receive-Job -Job $job $app } else { ("Job not completed: " + $job.Name + "@" + $job.State + ". Reason:" + $job.ChildJobs[0].JobStateInfo.Reason) Remove-Job -Job $job -Force } } The query succeeds when run directly and fails when run -AsJob. Reason:System.UnauthorizedAccessException: Access is denied. I've jiggered with -Impersonation, -Credentials, -Authority, and -EnableAllPrivileges to no useful effect. It appears I'm overlooking something fundamental. Why is my Powershell prompt allowed to connect to the remote server, but my child process denied?

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• ASP.NET MVC 2 Dynamic QueryString Management

  - by vikas anand

  Hello All, I am very new to ASP.NET MVC and currently, I am involved in developing a new application in ASP.NET MVC 2. I am having problem in managing a long querystring parameters that comes from dBase. For example, in any non-mvc app the following URL works well: http ://example.com/test.aspx?first_name=fname&last_name=lname&email_id=email&address1=add1&address2=add2&city=city&state=state&zip_code=zip and so on. The QueryString parameter can be determined on the fly (i.e. at run-time). Now for dynamic QueryString how routing will be done? Also for a simple URL, the URL will be as follows (in ASP.NET MVC): http ://example.com/test/id/category But for above mentioned dynamic & long QueryString how the URL will look like? Will all the QueryString parameters be separated through slash (/)? Thanks in advance for your help. Best Regards, Vikas Anand

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• Why does WPF toggle button pulse once unchecked

  - by randyc

  Wihtin a Desktop app I have a toggle button: For the Checked event I am setting a value and then executing a method FilterView(); //ommitting code Unchecked state is just the opposite. resets a variable and executed the method again The question I have is I noticed when I uncheck the toggle button the button continues to pulse or flash ( going from blue to chrome) as if it still has focus. The button will stay like this until another button is clicked. Is there a way to remove this focus so that when the button is unchecked the button goes back to a unchecked state without the flashing / pulsing color. As you can see from above this is a standard toggle button no styles or custom I tested this on just a regular button and I found the same occured when clicked the button will continue to pulse / flash until another button is clicked. How do you work around this or prevent this effect from happening. Thank you

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• How does one paint the entire row's background in a QStyledItemDelegate ?

  - by Casey Link

  I have a QTableView which I am setting a custom QStyledItemDelegate on. In addition to the custom item painting, I want to style the row's background color for the selection/hovered states. The look I am going for is something like this KGet screenshot: Here is my code: void MyDelegate::paint( QPainter* painter, const QStyleOptionViewItem& opt, const QModelIndex& index ) const { QBrush backBrush; QColor foreColor; bool hover = false; if ( opt.state & QStyle::State_MouseOver ) { backBrush = opt.palette.color( QPalette::Highlight ).light( 115 ); foreColor = opt.palette.color( QPalette::HighlightedText ); hover = true; } QStyleOptionViewItemV4 option(opt); initStyleOption(&option, index); painter->save(); const QStyle *style = option.widget ? option.widget->style() : QApplication::style(); const QWidget* widget = option.widget; if( hover ) { option.backgroundBrush = backBrush; } painter->save(); style->drawPrimitive(QStyle::PE_PanelItemViewItem, &option, painter, widget); painter->restore(); switch( index.column() ) { case 0: // we want default behavior style->drawControl(QStyle::CE_ItemViewItem, &option, painter, widget); break; case 1: // some custom drawText break; case 2: // draw a QStyleOptionProgressBar break; } painter->restore(); } The result is that each individual cell receives the mousedover background only when the mouse is over it, and not the entire row. It is hard to describe so here is a screenshot: In that picture the mouse was over the left most cell, hence the highlighted background.. but I want the background to be drawn over the entire row. How can I achieve this? Edit: With some more thought I've realized that the QStyle::State_MouseOver state is only being passed for actual cell which the mouse is over, and when the paint method is called for the other cells in the row QStyle::State_MouseOver is not set. So the question becomes is there a QStyle::State_MouseOver_Row state (answer: no), so how do I go about achieving that?

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• How to GET a read-only vs editable resource in REST style?

  - by Val

  I'm fairly familiar with REST principles, and have read the relevant dissertation, Wikipedia entry, a bunch of blog posts and StackOverflow questions on the subject, but still haven't found a straightforward answer to a common case: I need to request a resource to display. Depending on the resource's state, I need to render either a read-only or an editable representation. In both cases, I need to GET the resource. How do I construct a URL to get the read-only or editable version? If my user follows a link to GET /resource/<id>, that should suffice to indicate to me that s/he needs the read-only representation. But if I need to server up an editable form, what does that URL look like? GET /resource/<id>/edit is obvious, but it contains a verb in the URL. Changing that to GET /resource/<id>/editable solves that problem, but at a seemingly superficial level. Is that all there is to it -- change verbs to adjectives? If instead I use POST to retrieve the editable version, then how do I distinguish between the POST that initially retrieves it, vs the POST that saves it? My (weak) excuse for using POST would be that retrieving an editable version would cause a change of state on the server: locking the resource. But that only holds if my requirements are to implement such a lock, which is not always the case. PUT fails for the same reason, plus PUT is not enabled by default on the Web servers I'm running, so there are practical reasons not to use it (and DELETE). Note that even in the editable state, I haven't made any changes yet; presumably when I submit the resource to the Web server again, I'd POST it. But to get something that I can later POST, the server has to first serve up a particular representation. I guess another approach would be to have separate resources at the collection level: GET /read-only/resource/<id> and GET /editable/resource/<id> or GET /resource/read-only/<id> and GET /resource/editable/<id> ... but that looks pretty ugly to me. Thoughts?

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• MySQL create stored procedure fails but all internal queries succeed alone?

  - by Mark

  Hi all, I just created a simple database in MySQL, and I am learning how to write stored proc's. I'm familiar with M$SQL and as far as I can see the following should work: use mydb; -- -------------------------------------------------------------------------------- -- Routine DDL -- -------------------------------------------------------------------------------- DELIMITER // CREATE PROCEDURE mydb.doStats () BEGIN CREATE TABLE IF NOT EXISTS resultprobability ( ballNumber INT NOT NULL , probability FLOAT NULL, PRIMARY KEY (ballNumber) ); CREATE TABLE IF NOT EXISTS drawProbability ( drawDate DATE NOT NULL , ball1 INT NULL , ball2 INT NULL , ball3 INT NULL , ball4 INT NULL , ball5 INT NULL , ball6 INT NULL , ball7 INT NULL , score FLOAT NULL , PRIMARY KEY (drawDate) ); TRUNCATE TABLE resultprobability; TRUNCATE TABLE drawprobability; INSERT INTO resultprobability (ballNumber, probability) (select resultset.ballNumber ballNumber,(count(0)/(select count(0) from resultset)) probability from resultset group by resultset.ballNumber); INSERT INTO drawProbability (drawDate, ball1, ball2, ball3, ball4, ball5, ball6, ball7, score) (select distinct r.drawDate, a.ballnumber ball1, b.ballnumber ball2, c.ballnumber ball3, d.ballnumber ball4, e.ballnumber ball5, f.ballnumber ball6,g.ballnumber ball7, ((a.probability + b.probability + c.probability + d.probability + e.probability + f.probability + g.probability)/7) score from resultset r inner join (select r.drawDate, r.ballNumber, p.probability from resultset r inner join resultprobability p on p.ballNumber = r.ballNumber where r.appearence = 1) a on a.drawdate = r.drawDate inner join (select r.drawDate, r.ballNumber, p.probability from resultset r inner join resultprobability p on p.ballNumber = r.ballNumber where r.appearence = 2) b on b.drawdate = r.drawDate inner join (select r.drawDate, r.ballNumber, p.probability from resultset r inner join resultprobability p on p.ballNumber = r.ballNumber where r.appearence = 3) c on c.drawdate = r.drawDate inner join (select r.drawDate, r.ballNumber, p.probability from resultset r inner join resultprobability p on p.ballNumber = r.ballNumber where r.appearence = 4) d on d.drawdate = r.drawDate inner join (select r.drawDate, r.ballNumber, p.probability from resultset r inner join resultprobability p on p.ballNumber = r.ballNumber where r.appearence = 5) e on e.drawdate = r.drawDate inner join (select r.drawDate, r.ballNumber, p.probability from resultset r inner join resultprobability p on p.ballNumber = r.ballNumber where r.appearence = 6) f on f.drawdate = r.drawDate inner join (select r.drawDate, r.ballNumber, p.probability from resultset r inner join resultprobability p on p.ballNumber = r.ballNumber where r.appearence = 7) g on g.drawdate = r.drawDate order by score desc); END // DELIMITER ; instead i get the following Executed successfully in 0.002 s, 0 rows affected. Line 1, column 1 Error code 1064, SQL state 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 26 Line 6, column 1 Error code 1064, SQL state 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')) probability from resultset group by resultset.ballNumber); INSERT INTO d' at line 1 Line 31, column 51 Error code 1064, SQL state 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') score from resultset r inner join (select r.drawDate, r.ballNumber, p.probabi' at line 1 Line 39, column 114 Execution finished after 0.002 s, 3 error(s) occurred. What am I doing wrong? I seem to have exhausted my limited mental abilities!

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• httpd keeps crashing without any reference to why in the logs

  - by Fred

  I have the logs set to debug in the hopes of tracking down what's causing the crash, but I can't find anything. Here is the error_log. [Thu Jan 06 10:27:35 2011] [debug] proxy_util.c(1967): proxy: initialized single connection worker 0 in child 19999 for (*) [Thu Jan 06 14:47:04 2011] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec) [Thu Jan 06 14:47:04 2011] [info] Init: Seeding PRNG with 256 bytes of entropy [Thu Jan 06 14:47:04 2011] [info] Init: Generating temporary RSA private keys (512/1024 bits) [Thu Jan 06 14:47:04 2011] [info] Init: Generating temporary DH parameters (512/1024 bits) [Thu Jan 06 14:47:04 2011] [info] Init: Initializing (virtual) servers for SSL [Thu Jan 06 14:47:04 2011] [info] Server: Apache/2.2.3, Interface: mod_ssl/2.2.3, Library: OpenSSL/0.9.8e-fips-rhel5 [Thu Jan 06 14:47:04 2011] [notice] Digest: generating secret for digest authentication ... [Thu Jan 06 14:47:04 2011] [notice] Digest: done [Thu Jan 06 14:47:04 2011] [debug] util_ldap.c(2021): LDAP merging Shared Cache conf: shm=0xb9dc2480 rmm=0xb9dc24b0 for VHOST: server.fredfinn.com [Thu Jan 06 14:47:04 2011] [info] APR LDAP: Built with OpenLDAP LDAP SDK [Thu Jan 06 14:47:04 2011] [info] LDAP: SSL support available [Thu Jan 06 14:47:05 2011] [info] Init: Seeding PRNG with 256 bytes of entropy [Thu Jan 06 14:47:05 2011] [info] Init: Generating temporary RSA private keys (512/1024 bits) [Thu Jan 06 14:47:05 2011] [info] Init: Generating temporary DH parameters (512/1024 bits) [Thu Jan 06 14:47:05 2011] [debug] ssl_scache_shmcb.c(374): shmcb_init allocated 512000 bytes of shared memory [Thu Jan 06 14:47:05 2011] [debug] ssl_scache_shmcb.c(554): entered shmcb_init_memory() [Thu Jan 06 14:47:05 2011] [debug] ssl_scache_shmcb.c(576): for 512000 bytes, recommending 4266 indexes [Thu Jan 06 14:47:05 2011] [debug] ssl_scache_shmcb.c(619): shmcb_init_memory choices follow [Thu Jan 06 14:47:05 2011] [debug] ssl_scache_shmcb.c(621): division_mask = 0x1F [Thu Jan 06 14:47:05 2011] [debug] ssl_scache_shmcb.c(623): division_offset = 64 [Thu Jan 06 14:47:05 2011] [debug] ssl_scache_shmcb.c(625): division_size = 15998 [Thu Jan 06 14:47:05 2011] [debug] ssl_scache_shmcb.c(627): queue_size = 1604 [Thu Jan 06 14:47:05 2011] [debug] ssl_scache_shmcb.c(629): index_num = 133 [Thu Jan 06 14:47:05 2011] [debug] ssl_scache_shmcb.c(631): index_offset = 8 [Thu Jan 06 14:47:05 2011] [debug] ssl_scache_shmcb.c(633): index_size = 12 [Thu Jan 06 14:47:05 2011] [debug] ssl_scache_shmcb.c(635): cache_data_offset = 8 [Thu Jan 06 14:47:05 2011] [debug] ssl_scache_shmcb.c(637): cache_data_size = 14386 [Thu Jan 06 14:47:05 2011] [debug] ssl_scache_shmcb.c(650): leaving shmcb_init_memory() [Thu Jan 06 14:47:05 2011] [info] Shared memory session cache initialised [Thu Jan 06 14:47:05 2011] [info] Init: Initializing (virtual) servers for SSL [Thu Jan 06 14:47:05 2011] [info] Server: Apache/2.2.3, Interface: mod_ssl/2.2.3, Library: OpenSSL/0.9.8e-fips-rhel5 [Thu Jan 06 14:47:05 2011] [warn] pid file /etc/httpd/run/httpd.pid overwritten -- Unclean shutdown of previous Apache run? [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1854): proxy: grabbed scoreboard slot 0 in child 26527 for worker proxy:reverse [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1967): proxy: initialized single connection worker 0 in child 26527 for (*) [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1854): proxy: grabbed scoreboard slot 0 in child 26528 for worker proxy:reverse [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1873): proxy: worker proxy:reverse already initialized [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1967): proxy: initialized single connection worker 0 in child 26528 for (*) [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1854): proxy: grabbed scoreboard slot 0 in child 26529 for worker proxy:reverse [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1873): proxy: worker proxy:reverse already initialized [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1967): proxy: initialized single connection worker 0 in child 26529 for (*) [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1854): proxy: grabbed scoreboard slot 0 in child 26530 for worker proxy:reverse [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1873): proxy: worker proxy:reverse already initialized [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1967): proxy: initialized single connection worker 0 in child 26530 for (*) [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1854): proxy: grabbed scoreboard slot 0 in child 26532 for worker proxy:reverse [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1873): proxy: worker proxy:reverse already initialized [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1967): proxy: initialized single connection worker 0 in child 26532 for (*) [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1854): proxy: grabbed scoreboard slot 0 in child 26533 for worker proxy:reverse [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1873): proxy: worker proxy:reverse already initialized [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1967): proxy: initialized single connection worker 0 in child 26533 for (*) [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1854): proxy: grabbed scoreboard slot 0 in child 26534 for worker proxy:reverse [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1873): proxy: worker proxy:reverse already initialized [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1967): proxy: initialized single connection worker 0 in child 26534 for (*) [Thu Jan 06 14:47:05 2011] [notice] Apache/2.2.3 (CentOS) configured -- resuming normal operations [Thu Jan 06 14:47:05 2011] [info] Server built: Aug 30 2010 12:32:08 [Thu Jan 06 14:47:05 2011] [debug] prefork.c(991): AcceptMutex: sysvsem (default: sysvsem) [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1854): proxy: grabbed scoreboard slot 0 in child 26531 for worker proxy:reverse [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1873): proxy: worker proxy:reverse already initialized [Thu Jan 06 14:47:05 2011] [debug] proxy_util.c(1967): proxy: initialized single connection worker 0 in child 26531 for (*) The logs are setup as: ErrorLog logs/error_log LogLevel debug LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined LogFormat "%h %l %u %t \"%r\" %>s %b" common LogFormat "%{Referer}i -> %U" referer LogFormat "%{User-agent}i" agent CustomLog logs/access_log common CustomLog logs/access_log combined ServerSignature On

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• Is it a good object-oriented-design practice to send a pointer to private data to another class?

  - by Denis

  Hello everyone, There is well known recommendation not to include into class interface method that returns a pointer (or a reference) to private data of the class. But what do you think about public method of a class that sends to another class a pointer to the private data of the first one. For example: class A { public: void fA(void) {_b.fB(&_var)}; private: B _b; int _var; }; I think that it is some sort of data hiding damage: the private data define state of their own class, so why should one class delegate changes of its own state to another one? What do you think? Denis

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• CompliationLock throws HttpException when registering areas for ASP.NET MVC unit tests

  - by patridge

  The moment I added a unit test to my ASP.NET MVC application to test some of the area routing, I got an HttpException coming out of the System.Web.Complication.CompilationLock type initializer with the following stack trace. System.Web.HttpException : The type initializer for 'System.Web.Compilation.CompilationLock' threw an exception. ----> System.TypeInitializationException : The type initializer for 'System.Web.Compilation.CompilationLock' threw an exception. ----> System.NullReferenceException : Object reference not set to an instance of an object. at System.Web.Compilation.BuildManager.ReportTopLevelCompilationException() at System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() at System.Web.Compilation.BuildManager.GetReferencedAssemblies() at System.Web.Mvc.BuildManagerWrapper.System.Web.Mvc.IBuildManager.GetReferencedAssemblies() at System.Web.Mvc.TypeCacheUtil.FilterTypesInAssemblies(IBuildManager buildManager, Predicate`1 predicate) at System.Web.Mvc.TypeCacheUtil.GetFilteredTypesFromAssemblies(String cacheName, Predicate`1 predicate, IBuildManager buildManager) at System.Web.Mvc.AreaRegistration.RegisterAllAreas(RouteCollection routes, IBuildManager buildManager, Object state) at System.Web.Mvc.AreaRegistration.RegisterAllAreas(Object state) at System.Web.Mvc.AreaRegistration.RegisterAllAreas() at StpWeb.MvcApplication.RegisterRoutes(RouteCollection routes) in Global.asax.cs: line 16 at StpWeb.Tests.RoutesTest.TestFixtureSetUp() in RoutesTest.cs: line 11 --TypeInitializationException at System.Web.Compilation.CompilationLock.GetLock(ref Boolean gotLock) at System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() --NullReferenceException at System.Web.Compilation.CompilationLock..cctor()

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• custom button MouseLeave event

  - by Jelle

  Hi, I made a custom button with some panels and pictureboxes. With the MouseEnter and MouseLeave I set the appropriate hover images like normal buttons. The problem is that if I move the mouse too fast over the control it sometimes doesn't trigger the MouseLeave event. This way the button is "locked" in hover state. screenshot problem: http://www.jesconsultancy.nl/images/screens/screen_prblm.png the button at the right is locked in "hover" state. How can i solve this? Thanks.

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• Can I remove items from a ConcurrentDictionary from within an enumeration loop of that dictionary?

  - by the-locster

  So for example: ConcurrentDictionary<string,Payload> itemCache = GetItems(); foreach(KeyValuePair<string,Payload> kvPair in itemCache) { if(TestItemExpiry(kvPair.Value)) { // Remove expired item. Payload removedItem; itemCache.TryRemove(kvPair.Key, out removedItem); } } Obviously with an ordinary Dictionary this will throw an exception because removing items changes the dictionary's internal state during the life of the enumeration. It's my understanding that this is not the case for a ConcurrentDictionary as the provided IEnumerable handles internal state changing. Am I understanding this right? Is there a better pattern to use?

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• Does RVM "failover" to another ruby instance on error?

  - by JohnMetta

  Have a strange problem in that I have a Rake task that seems to be using multiple versions of Ruby. When one fails, it seems to try another one. Details MacBook running 10.6.5 rvm 1.1.0 Rubies: 1.8.7-p302, ree-1.8.7-2010.02, ruby-1.9.2-p0 Rake 0.8.7 Gem 1.3.7 Veewee (provisioning Virtual Machines using Opcode.com, Vagrant and Chef) I'm not entirely sure the specific details of the error matter, but since it might be an issue with Veewee itself. So, what I'm trying to do is build a new box base on a veewee definition. The command fails with an error about a missing method- but what's interesting is how it fails. Errors I managed to figure out that if I only have one Ruby installed with RVM, it just fails. If I have more than one Ruby install, it fails at the same place, but execution seems to continue in another interpreter. Here are two different clipped console outputs. I've clipped them for size. The full outputs of each error are available as a gist. One Ruby version installed Here is the command run when I only have a single version of Ruby (1.8.7) available in RVM boudica:veewee john$ rvm rake build['mettabox'] --trace rvm 1.1.0 by Wayne E. Seguin ([email protected]) [http://rvm.beginrescueend.com/] (in /Users/john/Work/veewee) ** Invoke build (first_time) ** Execute build … creating new harddrive rake aborted! undefined method `max_vdi_size' for #<VirtualBox::SystemProperties:0x102d6af80> /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/virtualbox-0.8.3/lib/virtualbox/abstract_model/dirty.rb:172:in `method_missing' <------ stacktraces cut ----------> /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/rake-0.8.7/bin/rake:31 /Users/john/.rvm/gems/ruby-1.8.7-p302@global/bin/rake:19:in `load' /Users/john/.rvm/gems/ruby-1.8.7-p302@global/bin/rake:19 Multiple Ruby Versions Here is the same command run with three versions of Ruby available in RVM. Prior to doing this, I used "rvm use 1.8.7." Again, I don't know how important the details of the specific errors are- what's interesting to me is that there are three separate errors- each with it's own stacktrace- and each in a different Ruby interpreter. Look at the bottom of each stacktrace and you'll see that they are all sourced from different interpreter locations- First ree-1.8.7, then ruby-1.8.7, then ruby-1.9.2: boudica:veewee john$ rvm rake build['mettabox'] --trace rvm 1.1.0 by Wayne E. Seguin ([email protected]) [http://rvm.beginrescueend.com/] (in /Users/john/Work/veewee) ** Invoke build (first_time) ** Execute build … creating new harddrive rake aborted! undefined method `max_vdi_size' for #<VirtualBox::SystemProperties:0x1059dd608> /Users/john/.rvm/gems/ree-1.8.7-2010.02/gems/virtualbox-0.8.3/lib/virtualbox/abstract_model/dirty.rb:172:in `method_missing' … /Users/john/.rvm/gems/ree-1.8.7-2010.02/gems/rake-0.8.7/bin/rake:31 /Users/john/.rvm/gems/ree-1.8.7-2010.02@global/bin/rake:19:in `load' /Users/john/.rvm/gems/ree-1.8.7-2010.02@global/bin/rake:19 (in /Users/john/Work/veewee) ** Invoke build (first_time) ** Execute build isofile ubuntu-10.04.1-server-amd64.iso is available ["a1b857f92eecaf9f0a31ecfc39dee906", "30b5c6fdddbfe7b397fe506400be698d"] [] Last good state: -1 Current step: 0 last good state -1 destroying machine+disks (re-)executing step 0-initial-a1b857f92eecaf9f0a31ecfc39dee906 VBoxManage: error: Machine settings file '/Users/john/VirtualBox VMs/mettabox/mettabox.vbox' already exists VBoxManage: error: Details: code VBOX_E_FILE_ERROR (0x80bb0004), component Machine, interface IMachine, callee nsISupports Context: "CreateMachine(bstrSettingsFile.raw(), name.raw(), osTypeId.raw(), Guid(id).toUtf16().raw(), FALSE , machine.asOutParam())" at line 247 of file VBoxManageMisc.cpp rake aborted! undefined method `memory_size=' for nil:NilClass /Users/john/Work/veewee/lib/veewee/session.rb:303:in `create_vm' /Users/john/Work/veewee/lib/veewee/session.rb:166:in `build' /Users/john/Work/veewee/lib/veewee/session.rb:560:in `transaction' /Users/john/Work/veewee/lib/veewee/session.rb:163:in `build' /Users/john/Work/veewee/Rakefile:87 /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/rake-0.8.7/lib/rake.rb:636:in `call' /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/rake-0.8.7/lib/rake.rb:636:in `execute' /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/rake-0.8.7/lib/rake.rb:631:in `each' … /Users/john/.rvm/gems/ruby-1.8.7-p302/gems/rake-0.8.7/bin/rake:31 /Users/john/.rvm/gems/ruby-1.8.7-p302@global/bin/rake:19:in `load' /Users/john/.rvm/gems/ruby-1.8.7-p302@global/bin/rake:19 (in /Users/john/Work/veewee) ** Invoke build (first_time) ** Execute build isofile ubuntu-10.04.1-server-amd64.iso is available ["a9c4ab3257e1da3479c984eae9905c2a", "30b5c6fdddbfe7b397fe506400be698d"] [] Last good state: -1 Current step: 0 last good state -1 (re-)executing step 0-initial-a9c4ab3257e1da3479c984eae9905c2a VBoxManage: error: Machine settings file '/Users/john/VirtualBox VMs/mettabox/mettabox.vbox' already exists VBoxManage: error: Details: code VBOX_E_FILE_ERROR (0x80bb0004), component Machine, interface IMachine, callee nsISupports Context: "CreateMachine(bstrSettingsFile.raw(), name.raw(), osTypeId.raw(), Guid(id).toUtf16().raw(), FALSE , machine.asOutParam())" at line 247 of file VBoxManageMisc.cpp rake aborted! undefined method `memory_size=' for nil:NilClass /Users/john/Work/veewee/lib/veewee/session.rb:303:in `create_vm' /Users/john/Work/veewee/lib/veewee/session.rb:166:in `block in build' /Users/john/Work/veewee/lib/veewee/session.rb:560:in `transaction' /Users/john/Work/veewee/lib/veewee/session.rb:163:in `build' /Users/john/Work/veewee/Rakefile:87:in `block in <top (required)>' /Users/john/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rake.rb:634:in `call' /Users/john/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rake.rb:634:in `block in execute' … /Users/john/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rake.rb:2013:in `top_level' /Users/john/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/rake.rb:1992:in `run' /Users/john/.rvm/rubies/ruby-1.9.2-p0/bin/rake:35:in `<main>' It isn't until we reach the last installed version of Ruby that execution halts. Discussion Does anyone have any idea what's going on here? Has anyone seen this "failover"-like behavior before? It seems strange to me that the first exception would not halt execution as it did with one interpreter, but I wonder if there are things happening when RVM is installed that we Ruby developers are not considering.

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• Collection <NSCFSet: 0x1b0b30> was mutated while being enumerated. How to determine which set?

  - by jamone

  I'm doing a bunch of core data inserts and after 20k or so inserts with saves every 1-2k I get this error: Terminating app due to uncaught exception 'NSGenericException', reason: '*** Collection <NSCFSet: 0x1b0b30> was mutated while being enumerated.' I'm trying to figure out which NSSet is causing this. I've done a search and the only NSSets in my code are the autogenerated ones that handle the Core Data relationships. I'm using NSXMLParser and for each element found creating a new entity (if a matching one doesn't already exist). So I will create a state entity and then populate all the city entities and then do a save. This means that a state's NSSet *cities is getting added to but I don't see why you can't do that.

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• FireandForget delegate - c#

  - by uno

  I came across this link, link text In the article, where the author has definition of this method static void WriteIt(string first, string second, int num) I changed that in my test app to this static void WriteIt(CustomerObject Customer) { fileIO.CreateFile(XMLUtil.Serialize(Customer)); } Where public static string Serialize(object o) { System.Xml.Serialization.XmlSerializerNamespaces ns = new System.Xml.Serialization.XmlSerializerNamespaces(); ns.Add("", ""); return Serialize(o, ns); } public static string Serialize(object o, XmlSerializerNamespaces ns) { try { using (System.IO.MemoryStream m = new System.IO.MemoryStream()) { //serialize messagelist to xml XmlSerializer serializer = new XmlSerializer(o.GetType(), ""); if (ns != null) serializer.Serialize(m, o, ns); else serializer.Serialize(m, o); m.Position = 0; byte[] b = new byte[m.Length]; m.Read(b, 0, b.Length); return System.Text.UTF8Encoding.UTF8.GetString(b); } } catch (Exception ex) { return "Ex = " + ex.ToString(); } } This method always gives an exception static void EndWrapperInvoke (IAsyncResult ar) { wrapperInstance.EndInvoke(ar); ar.AsyncWaitHandle.Close(); } Stacktrace: Server stack trace: at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) at System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks) at System.Delegate.DynamicInvokeImpl(Object[] args) at System.Delegate.DynamicInvoke(Object[] args) at SRC.FileMover.ThreadUtil.InvokeWrappedDelegate(Delegate d, Object[] args) at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs) at System.Runtime.Remoting.Messaging.StackBuilderSink.PrivateProcessMessage(RuntimeMethodHandle md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs) at System.Runtime.Remoting.Messaging.StackBuilderSink.AsyncProcessMessage(IMessage msg, IMessageSink replySink) Exception rethrown at [0]: at System.Runtime.Remoting.Proxies.RealProxy.EndInvokeHelper(Message reqMsg, Boolean bProxyCase) at System.Runtime.Remoting.Proxies.RemotingProxy.Invoke(Object NotUsed, MessageData& msgData) at SRC.FileMover.ThreadUtil.DelegateWrapper.EndInvoke(IAsyncResult result) at SRC.FileMover.ThreadUtil.EndWrapperInvoke(IAsyncResult ar) at System.Runtime.Remoting.Messaging.AsyncResult.SyncProcessMessage(IMessage msg) at System.Runtime.Remoting.Messaging.StackBuilderSink.AsyncProcessMessage(IMessage msg, IMessageSink replySink) at System.Runtime.Remoting.Proxies.AgileAsyncWorkerItem.DoAsyncCall() at System.Runtime.Remoting.Proxies.AgileAsyncWorkerItem.ThreadPoolCallBack(Object o) at System.Threading._ThreadPoolWaitCallback.WaitCallback_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading._ThreadPoolWaitCallback.PerformWaitCallbackInternal(_ThreadPoolWaitCallback tpWaitCallBack) at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback(Object state) UPDATE 1: Trying to run my app and get the full exception. It seems like its happening at different locations. I will repost my ? again shortly. I think it may be wise if I can post my application. Can i upload a .zip file or is it better to just post the .cs code that I am using?

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