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• How are .NET 4 GUIDs generated?

  - by mafutrct

  I am aware of the multitude of questions here as well as Raymond's excellent (as usual) post. However, since the algorithm to create GUIDs was changed apparently, I found it hard to get my hands on any up-to-date information. The MSDN seems to try and provide as few information as possible. What is known about how GUIDs are generated in .NET 4? What was changed, and how does it affect the security ("randomness") and integrity ("uniqueness")? One specific aspect I'm interested in: In v1, it seems to be about impossible to generate the same GUID on a single machine again since there was a timestamp and counter involved. In v4, this is no longer the case (I was told), so the chance to get the same GUID on a single machine ... increased?

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• Determine the colours used by the ASP.NET Chart control

  - by Moose Factory

  I'd like to find out which colours are used for a particular pallette in the ASP.NET Chart control. I already know there is an enum on the Chart class to set the palette, e.g. myChart.Palette = ChartColorPalette.Berry; But I'd like to know which colours belong to the palette. Before anyone asks - as I know you will - the reason I need to know the colours is because I want to create my own legend outside of the chart image. I also know that I can set my own colours on the DataPoints for the chart, but I'd rather not have to implement my own palette.

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• Storing Interface type in ASP.NET Profile

  - by NathanD

  In my ASP.NET website all calls into the data layer return entities as interfaces and the website does not need to know what the concrete type is. This works fine, but I have run into a problem when trying to store one of those types into the user Profile. My interface implements ISerializable, like the following: public interface IInsured : IPerson, IEntity, ISerializable and the concrete type in the datalayer does implement ISerializable. My Profile property in web.config is: <add name="ActiveInsured" type="FacadeInterfaces.IInsured" serializeAs="Binary" defaultValue="[null]"/> It compiles just fine, but I get a runtime error on Profile.Save() saying that the interface cannot be serialized. I have also tried it with serializeAs="Xml". I thought that if my interface implemented ISerializable it would work. Anybody had this problem before or know of a workaround?

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• Keep an object for the time the connection is running in ASP.NET

  - by vtortola

  Hi, I'm developing a web service with ASP.NET, is not an .asmx or WCF, it's a custom one, so I'm working with the Http classes (context, request, response, etc..). Session is disabled. I'm working with my own handler and module. I'd like to keep a object alive and accessible for the time the connection is alive. I mean, a request enters, I assign a DbCommand to it and that connection will use that command as long is doing things, when that connection is ended, the object should be disposed. I've thought, that I can add it to my IPrincipal implementation, then when the connection is authenticated in the module and the user retrieved, I can add that DbCommand to the IPrincipal, so I can retrieve it from wherever I want in the code, and after in the module EndRequest event, I can dispose it, but I don't know if there is a better approach to do this. What do you think? cheers

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• WCF is throwing UnauthorizedAccessExceptyion after upgrade to .NET 4.0

  - by Andrey

  I have a pretty simple client-server ASP.NET app; communication is via WCF service. All worked perferctly inVS 2008, now I upgraded to VS2010 and every time the client code is trying to instantiate a channel to the server: new ChannelFactory<IMemberService>("Members.MemberService").CreateChannel(); it throws an UnauthorizedAccessException "Access denied". Were there any breaking changes in the new version, or do I need to add some configuration? I'm pretty stuck, any ideas would be highly appreciated! BTW, binding used is basicHttpBinding, i don't know if thats important here. Thank you, Andrey

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• .NET 4.0 project reference 2.0 assembly

  - by jamone

  I have a project in which I'd like to use some of the .NET 4.0 features but a core requirement is that I can use the System.Data.SQLite framework which is compiled against 2.X. I see mention of this being possible such as the accepted answer here but I don't see how to actually achieve this. When I just try and run my 4.0 project while referencing the 2.X assembly I get: Mixed mode assembly is built against version 'v2.0.50727' of the runtime and cannot be loaded in the 4.0 runtime without additional configuration information. What "additional configuration" is necessary?

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• Loginview control asp.net mvc

  - by vikitor

  Hello all, I have been searching and haven't got luck, I got a tutorial to use the loginview control in order to display or hide parts of the views to different user roles in my application. The thing is that the tutorial I've found is for ASP.NET and I've been told by one of my colleages that it is the same framework for ASP.NET MVC but the way to use it is different. Have you got any good tutorial to recommend? EDIT: I've got all my application set up, and the login and the roles already configured (via asp.net membership provider). This is all already running. The thing is that if I have role a and role b I want role a to be able to actually see the links to the actions it is authorized to work with, and not b for example. If in the Index of my application I've got a link to "Edit" and only the role a can access to the action, then it will be displayed just for logged in users that belong to role a, and not to those who belong to role b Thank you, Vikitor

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• ASP.NET CompositeControl with child controls that contain children

  - by tomfanning

  I am building an ASP.NET server control which extends CompositeControl. I need fine grained control over the rendering, so I override Render() and output the child controls myself, interspersed with HTML generation code: writer.AddStyleAttribute("float", "left"); writer.RenderBeginTag(System.Web.UI.HtmlTextWriterTag.Div); writer.RenderBeginTag(System.Web.UI.HtmlTextWriterTag.Strong); writer.Write("Table"); writer.RenderEndTag(); // strong writer.WriteBreak(); tableList.RenderControl(writer); writer.RenderEndTag(); // div This works really well for user controls that just contain simple controls without children of their own. However, if I want to use something like a MultiView or an UpdatePanel I run into problems, since I can't override Render() on View or UpdatePanel without extending them, and if I do extend them the implementation would presumably have to depend on FindControl() voodoo to get references to the right controls during render. That doesn't sound like the right way to do this - is there a better way?

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• When are ASP.NET Expression Builders most useful?

  - by SkippyFire

  I saw an example of using Expression Builders, and creating your own Custom Expression Builder Classes here: http://aspnet.4guysfromrolla.com/articles/022509-1.aspx However, I fail to see the value in using this approach. It doesn't seem much easier than programmatically setting values in your code behind. As far as I can tell, the only thing you can do with them is set properties. Maybe they would be useful for setting defaults on certain controls? Can anyone shed light on where this ASP.NET feature becomes powerful?

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• ASP.NET 3.5 Web Site stopped importing System namespace by default

  - by Alexis

  I have a VB Web Site project that has recently (and mysteriously) stopped importing the "System" namespace by default. I'm having to either place a "Imports System" line at the top of each code behind, or preface everything with "System", which is fairly annoying, not to mention redundant. I can't for the life of me figure out how to get the System namespace back to being imported by default. I've already checked to see that WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG\web.config contains the <add namespace="System"/> line--it does. That was my best lead. I'm tearing my hair out. Does anyone have any suggestions?

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• How to add a view helper directory (zend framework)

  - by Cédric Girard

  Hi, I begin with ZF (1.9.7), and I want to use View Helpers from a library shared between all my projects. But I can't find how to add it directory to the helpers path. My herpers works fines when I put them in application's helpers path. Here is the error, where I find the path to ZF helpers, and path to the applications ones. object(ArrayObject)#71 (3) { ["exception"]=> object(Zend_Loader_PluginLoader_Exception)#70 (6) { ["message:protected"]=> string(151) "Plugin by name 'Voo' was not found in the registry; used paths: Zend_View_Helper_: Zend/View/Helper/;C:/ZendStd/www/applis/VOO4_PROJECTX/views\helpers/" ["string:private"]=> string(0) "" ["code:protected"]=> int(0) ["file:protected"]=> string(89) "C:\Program Files\Zend\ZendServer\share\ZendFramework\library\Zend\Loader\PluginLoader.php" ["line:protected"]=> int(401) Best regards Cédric

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• asp.net Dynamic Data Site with custom own MetaData

  - by loviji

  Hello, I'm searching info about configuring own MetaData in asp.NET Dynamic Site. For example. I have a table in MS Sql Server with structure shown below: CREATE TABLE [dbo].[someTable]( [id] [int] NOT NULL, [pname] [nvarchar](20) NULL, [FullName] [nvarchar](50) NULL, [age] [int] NULL) and I there are 2 Ms Sql tables (I've created), sysTables and sysColumns. sysTables: ID sysTableName TableName TableDescription 1 | someTable |Persons |All Data about Persons in system sysColumns: ID TableName sysColumnName ColumnName ColumnDesc ColumnType MUnit 1 |someTable | sometable_pname| Name | Persona Name(ex. John)| nvarchar(20) | null 2 |someTable | sometable_Fullname| Full Name | Persona Name(ex. John Black)| nvarchar(50) | null 3 |someTable | sometable_age| age | Person age| int | null I want that, in Details/Edit/Insert/List/ListDetails pages use as MetaData sysColumns and sysTableData. Because, for ex. in DetailsPage fullName, it is not beatiful as Full Name . someIdea, is it possible? thanks

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• ODP.NET Code Example Critque or best practices

  - by andrewWinn

  I currently have a DataAccess Layer in Vb.Net. I am not too happy with my implementation of both my ExecuteQuery (as DataSet) and ExecuteNonQuery functions. Does anyone have any code that I could see? My code just doesn't look clean. Any thoughts or critiques on it would be appreciated also. Using odpConn As OracleConnection = New OracleConnection(_myConnString) odpConn.Open() If _beginTransaction Then txn = odpConn.BeginTransaction(IsolationLevel.Serializable) End If Try Using odpCmd As OracleCommand = odpConn.CreateCommand() odpCmd.CommandType = CommandType.Text odpCmd.CommandText = sSql For i = 0 To parameters.Parameters.Count - 1 Dim prm As New OracleParameter prm = DirectCast(parameters.Parameters(i), ICloneable).Clone odpCmd.Parameters.Add(prm) Next If (odpConn.State = ConnectionState.Closed) Then odpConn.Open() End If iToReturn = odpCmd.ExecuteNonQuery() If _beginTransaction Then txn.Commit() End If End Using Catch txn.Rollback() End Try End Using

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• Unable to send email on production server with ASP.NET MVC

  - by Davide Vosti

  I have a simple ASP.NET MVC application with a contact page. In my development machine (local) I can send successfully emails (I specify host and credentials), but on the production server this doesn't work and I get this error: System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable. The server response was: Requested action not taken: mailbox unavailable or not local at System.Net.Mail.SmtpTransport.SendMail... The server is in my LAN (the mail server too). I tried with multiple accounts but I have errors every time. Credentials for the account are provided at runtime with smtp.Credentials = new NetworkCredential("username", "password"); Any idea? Thanks

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• Asp.Net 3.5 Routing to Webservice?

  - by Maushu

  I was looking for a way to route http://www.example.com/WebService.asmx to http://www.example.com/service/ using only the ASP.NET 3.5 Routing framework without needing to configure the IIS server. Until now I have done what most tutorials told me, added a reference to the routing assembly, configured stuff in the web.config, added this to the Global.asax: protected void Application_Start(object sender, EventArgs e) { RouteCollection routes = RouteTable.Routes; routes.Add( "WebService", new Route("service/{*Action}", new WebServiceRouteHandler()) ); } ...created this class: public class WebServiceRouteHandler : IRouteHandler { public IHttpHandler GetHttpHandler(RequestContext requestContext) { // What now? } } ...and the problem is right there, I don't know what to do. The tutorials and guides I've read use routing for pages, not webservices. Is this even possible? Ps: The route handler is working, I can visit /service/ and it throws the NotImplementedException I left in the GetHttpHandler method.

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• How to make a DropDownList control display some items in bold ASP.Net

  - by james lewis

  I'm working with a custom DropDownList control in ASP.Net and there's been a request to display certain items in the list with a bold typeface (NOTE - the control inherits from CompositeDataBoundControl so it can be data bound... not DropDownListBox). The control is bound to a table and there's a column in the table named IsUsed - if this is set to true, the corresponding item in the list should be rendered bold. (It should be noted here that this will only ever be viewed in FireFox.) My experience is all in the middle \ backend tiers so the presentation layer is very new to me - can someone point me in the right direction? My initial thought was that somewhere in the custom control I would have access to all the rows that are returned from the data source which I could cycle through etc but I'm not sure if that's possible... There's also RenderContents which I can override... looks interesting! Any help appreciated - cheers. James

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• How should I debug a vb.net website in iis6 that is throwing 'Deadlock detected' errors and becomes

  - by jskunkle

  A few times a day, our vb.net (IIS 6.0) website is randomly throwing the following error and becomes completely unavailable for 5-15 minutes at a time while the application is recycled: ISAPI 'c:\windows\microsoft.net\framework\v2.0.50727\aspnet_isapi.dll' reported itself as unhealthy for the following reason: 'Deadlock detected'. The website ran for months on the exact same server in beta without problem - but the problem started over the weekend when we made the site live. The live site is under some load but less than many of our other production websites. How should I attack this problem? I've looked into orphaning the worker process and creating a dump file - but I'm not sure how to analyze that. Any advice or information is appreciated. Thanks, Shane

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• Subscription payment processing with ASP.NET

  - by bobsmith123

  I would like to create a subscription based website with users getting charged every month. I know I have to create an account with paypal or authorize.net. Do these payment providers automatically bill the user every month? How would I take care of offering the service free for 30 days and start billing after that? Also, I've heard of middle men services like spreedly, chargify. Where do they fit into the equation? Can someone help me wrap my head around these concepts? Considering, I am based in the U.S but would like to have the payment provider accept any kind of currency. Which payment provider do you suggest?

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• How can we expose a .NET public const to COM interop

  - by JulienC

  For historical reasons, we need to expose string constants in .NET through COM interface. We managed to expose ENUM but we can't find a way to expose string const. We try the following code : <ComClass(ComClass1.ClassId, ComClass1.InterfaceId, ComClass1.EventsId)> _ Public Class ComClass1 #Region "COM GUIDs" ' These GUIDs provide the COM identity for this class ' and its COM interfaces. If you change them, existing ' clients will no longer be able to access the class. Public Const ClassId As String = "608c6545-977e-4260-a3cf-11545c82906a" Public Const InterfaceId As String = "12b8a6c7-e7f6-4022-becd-2efd8b3a756e" Public Const EventsId As String = "05a2856f-d877-4673-8ea8-20f5a9f268d5" #End Region ' A creatable COM class must have a Public Sub New() ' with no parameters, otherwise, the class will not be ' registered in the COM registry and cannot be created ' via CreateObject. Public Sub New() MyBase.New() End Sub Public Const chaine As String = "TEST" Public Sub Method() End Sub End Class But when we look on the OLE object viewer, we only see the method. See ScreenShot: screenshot of OLE viewer Anyone have an idea ? Thanks,

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• Yield In VB.NET

  - by MagicKat

  C# has the keyword called yield. VB.NET lacks this keyword. I am curious how some of the VB programmers have gotten around the lack of this keyword. Do you implement your own iterator class? Or do you try and code to avoid the need of an iterator? The yield keyword does force the compiler to do some coding behind the scenes. http://blogs.msdn.com/oldnewthing/archive/2008/08/12/8849519.aspx is a good example of that.

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• .Net 3.5 Chart Controls Exception

  - by ChrisHDog

  I am using the new free .net chart controls and they appear to work fine when I run the project up in visual studio, but when hitting the same via IIS I get and exception: [HttpException (0x80004005): No http handler was found for request type 'GET'] System.Web.HttpApplication.MapIntegratedHttpHandler(HttpContext context, String requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig, Boolean convertNativeStaticFileModule) +529 System.Web.HttpServerUtility.Execute(String path, TextWriter writer, Boolean preserveForm) +947 [HttpException (0x80004005): Error executing child request for ChartImg.axd.] System.Web.HttpServerUtility.Execute(String path, TextWriter writer, Boolean preserveForm) +4120098 System.Web.UI.DataVisualization.Charting.ChartHttpHandler.EnsureInitialized(Boolean hardCheck) +266 System.Web.UI.DataVisualization.Charting.Chart.GetImageStorageMode() +25 System.Web.UI.DataVisualization.Charting.Chart.Render(HtmlTextWriter writer) +133 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240 System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +253 System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +87 System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +53 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240 System.Web.UI.Page.Render(HtmlTextWriter writer) +38 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4240 Any idea what I'm doing wrong? Thanks!

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• asp.net membership select provider

  - by Jonesy

  Hi folks, I've done this before but can't remember how for the life of me. I used aspnetreg_sql.exe to create the membership tables in my database. But now i cant seem to be able to point my web app to the correct database. In the provider settings in asp.net management interface i only see a radio button with the label "AspNetSqlProvider" but I can only test it (in which it always fails). I can't modify the connection. Can someone help me with this? Cheers, Billy

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• User can't login after creating them with the asp.net Create User Wizard

  - by Xaisoft

  When I create a user, they can't login until I go into the asp.net configuration and save them. I actually don't change any settings, I just press the save button and then they can login in. What I would like to do is to have the user be able to login once they are created, but I can't seem to get it to work. Here is my code for the CreatedUser method: protected void CreateUserWizard1_CreatedUser(object sender, EventArgs e) { CustomerProfile adminProfile = CustomerProfile.GetProfile(); string username = ((TextBox)CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("UserName")).Text.Trim(); CustomerProfile createdUser = CustomerProfile.GetProfile(username); createdUser.CustomerID = adminProfile.CustomerID; createdUser.Save(); MembershipUser user = Membership.GetUser(username); user.IsApproved = ((CheckBox)CreateUserWizard1.CreateUserStep.ContentTemplateContainer.FindControl("chkActivateUser")).Checked; Roles.AddUserToRole(user.UserName, "nonadmin"); }

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• How to stop .Net HttpWebRequest.GetResponse() raising an exception

  - by James

  Surely, surely, surely there is a way to configure the .Net HttpWebRequest object so that it does not raise an exception when HttpWebRequest.GetResponse() is called and any 300 or 400 status codes are returned? Jon Skeet does not think so, so I almost dare not even ask, but I find it hard to believe there is no way around this. 300 and 400 response codes are valid responses in certain circumstances. Why would we be always forced to incur the overhead of an exception? Perhaps there is some obscure configuration setting that evaded Jon Skeet? Perhaps there is a completely different type of request object that can be used that does not have this behavior? (and yes, I know you can just catch the exception and get the response from that, but I would like to find a way not to have to). Thanks for any help

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• ASP.NET Deployment under IIS7/VS2010 as Web Application

  - by adchased

  I transformed my VS2008 ASP.NET Website to a "Web Application" today using VS2010. So now it's possible to build a Deployment Package. A Zip Package which can be direclty imported into IIS7. Usually I added a website in IIS7 called mydomain.com and put everything in its root dir. That worked. However, since I converted to an Web Application, this Application is added beneath my "Website container". Now I'm confused, this is how it actually looks now when I try to open the website: Browsing to mydomain.com says 404 ERROR. Browsing to mydomain.com/mydomain.com opens the actual website, but in a subfolder instead of the root directory. (The Application is named after the Domain) How to make this application the root of the website now? I want the application to run under the mydomain.com ROOT and not some subfolder. Thanks a lot!

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