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• Practical differences between classes and structs in .net (not conceptual)?

  - by Gulshan

  Whenever I tried to search about differences between classes and structs in C# or .net, I ended up with the conceptual overview of the two things like value type or the reference type, where the variables are allocated etc. But I need some practical differences. I have found some like different behavior of assignment operator, having constructors etc. Can anybody provide some more practical differences which will be directly useful while coding? Like the things works with one but not with other or same operation showing different behavior. And some common mistakes regarding these two. Also please suggest where to consider using a struct instead of a class. And where the structs should not be used.

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• Monitor what users are doing in an .net Application and trigger application functionality changes.

  - by Jamie Clayton

  I need some suggestions for how to implement a very basic mechanism that logs what multiple users are doing in an application. When another feature is running I then need to change the application, to restrict functionality. Use Case Example User can normaly edit unpaid records. If the application then runs a Payrun process (Long), I need to then change parts of the application to restrict functionality for a short period of time (eg. Make existing unpaid records readonly). Any suggestions on how I can do this in a .net application?

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• 'Error serializing body'. Problem calling Fedex webservice through .NET 3.5

  - by Simon_Weaver

  I'm using Fedex's web services and getting an annoying error right up front before I can actually get anywhere. There was an error in serializing body of message addressValidationRequest1: 'Unable to generate a temporary class (result=1). error CS0030: Cannot convert type 'FedEx.InterOp.AddressValidationServiceReference.ParsedElement[]' to 'FedEx.InterOp.AddressValidationServiceReference.ParsedElement' error CS0029: Cannot implicitly convert type 'FedEx.InterOp.AddressValidationServiceReference.ParsedElement' to 'FedEx.InterOp.AddressValidationServiceReference.ParsedElement[]' '. Please see InnerException for more details. I'm using .NET 3.5 and get a horrible named class generated for me (I'm not sure why it isn't just AddressValidationService): AddressValidationPortTypeClient addressValidationService = new ...; on this class I make my web service call: addressValidationService.addressValidation(request); This is when I get this error. The only references I can find to this error come from ancient 1.1 projects. In my case my DLL has references to System.Web and System.Web.Services which seemed to be an issue back then.

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• Why am I unable to Debug my ASP.NET website in Visual Studio?

  - by willem

  I used to be able to attach to my w3wp process and Debug my web application, but this is not working anymore. I have no idea what changed to break this. My breakpoints simply have the "breakpoint will currently not be hit. The source code is different from the original version." What I have tried: Did a solution Clean. Did a solution Rebuild. Deleted the bin folder Restarted Visual Studio Restarted IIS Restarted my Computer Added a simple Response.Write to ensure that the latest DLL is being used. It is. Made sure that Debug ASP.NET is checked in my project properties. It is. Made sure that all my projects are compiled in my build configuration. They are. But none of these help. I attach to w3wp, but my breakpoints never get hit. Any ideas?

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• Why does ASP.NET web site reference assembly from GAC, when adding local reference?

  - by Konstantin

  When you use ASP.NET web site (instead of web application model) and add reference to an assembly from local folder, Visual Studio, it seems, understands that this local assembly is also in GAC and so does NOT copy this assembly to bin folder (as it does with non-GAC assemblies), but simply adds new record in web.config file. Why such a behaviour? Is it possible to force copy to bin folder (I need this since .dll is not on target environment)? I can add assembly to bin folder as file and it will work, but in this case bin folder contents will be in source control, which is not good.

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• .Net Regular expression - how to do an exact match exclusion on a full string?

  - by Nathan Ridley

  I need a .Net regular expression that matches anything OTHER than the exact full string match specified. So basically: ^Index$ ... is the only exclusion I care about. Strings can start with, finish with or contain "Index", but not match exactly. My brain doesn't seem to be working today and I'm failing to work this one out. EDIT The answer MUST be via the pattern itself, as I am passing an argument to a third party library and do not have control over the process other than via the Regex pattern.

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• What are the essential COM componenets required for burning DVD in c#.net in Windows XP?

  - by shruti

  im trying to burn DVD/CD through frontend C#.net code... i have used IMAPI2 for buring CD/DVD in windows XP..but it is giving me unhandeled exception... as:- System.InvalidCastException: Unable to cast COM object of type 'IMAPI2.Interop.MsftFileSystemImageClass' to interface type 'IMAPI2.Interop.MsftFileSystemImage'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{7CFF842C-7E97-4807-8304-910DD8F7C051}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)) can anyone plz help me out to solve this pbm...im not able to solve this error.. this project is working fine in Windows7 but unable to work with XP...???

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• How does this C# asp.net random password code work?

  - by quakkels

  Hello all, I'm new to .NET and C# and I'm trying to figure out how this code works: public static string CreateRandomPassword(int PasswordLength) { String _allowedChars = "abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ23456789"; Byte[] randomBytes = new Byte[PasswordLength]; RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider(); rng.GetBytes(randomBytes); char[] chars = new char[PasswordLength]; int allowedCharCount = _allowedChars.Length; for(int i = 0;i<PasswordLength;i++) { /// /// I don't understand how this line works: /// chars[i] = _allowedChars[(int)randomBytes[i] % allowedCharCount]; } return new string(chars); } I think I've got a pretty good handle on most of this. I haven't been able to understand the following line: chars[i] = _allowedChars[(int)randomBytes[i] % allowedCharCount]; I understand that the code generates random binary numbers and uses those random numbers in the for loop to select a character from the _allowedChars string. What I don't get is why this code uses the modulous operator (%) to get the _allowedChars index value. Thanks for any help

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• ASP.Net & 960.gs Integrating the .css files into a new project.

  - by Baxter

  I've got a full layout designed using 960.gs and am wanting to use it in a ASP.net website but i'm getting warnings such as: "Warning File 'css/Reset.css' was not found." "Warning File 'css/Text.css' was not found." "Warning File 'css/960.css' was not found." "Warning File 'css/Base.css' was not found." I've tried adding a new similarly named folder to the solution explorer and 'add existing item' to add them in but it still seems to cause warnings and intelisense isn't recognising any of the 960.gs classes. Is there a recommended workflow for importing all of this in? I should add that it works perfectly well on the local development server and on the webspace, it's seemingly just VS that's complaining.

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• .NET: What is the purpose of the ProhibitDtd property in XmlReaderSettings? Why is DTD a security i

  - by Cheeso

  The documentation says: When set to true, the XmlReader throws an XmlException when any DTD content is encountered. Do not enable DTD processing if you are concerned about Denial of Service issues or if you are dealing with untrusted sources. If you have DTD processing enabled, you can use the XmlSecureResolver to restrict the resources that the XmlReader can access. You can also design your application so that the XML processing is memory and time constrained. For example, configure time-out limits in your ASP.NET application. Can someone please explain the issue? Why would a reader application want to prohibit the retrieval of a DTD? Where is the denial-of-service issue, if it is a reading application? What is the "trust" issue that is mentioned? Thanks

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• Cannot execute a program. The command being executed "dqiitg0c.cmdline"

  - by Laxman

  i have used impersonation in this application. whenever this error occurs i required to restart the IIS.. please guide me to solve this issue. Error: Cannot execute a program. The command being executed was "C:\Windows\Microsoft.NET\Framework64\v2.0.50727\csc.exe" /noconfig /fullpaths @"C:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET Files\root\c825d188\1fae8a71\dqiitg0c.cmdline". 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.Runtime.InteropServices.ExternalException: Cannot execute a program. The command being executed was "C:\Windows\Microsoft.NET\Framework64\v2.0.50727\csc.exe" /noconfig /fullpaths @"C:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET Files\root\c825d188\1fae8a71\dqiitg0c.cmdline".

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• Easy to implement .net library for geocoding using a free service?

  - by Kjensen

  I need to geocode adresses (get lat/long from addresses) using in .Net, to store in the database. What is the library/project to look into, to get that done? After a search here, on google and codeplex.com, I have found there to be a few options, that seem like they will do what I ask for... But some of them could be crap and a waste of time - and some might just be stellar. Which one is the one to go for? Have you used any of them?

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• asp.net: Is it possible to have multiple login forms to access different subfolders?

  - by Anthony

  Hi, Is it possible to have multiple login pages for different folders within an asp.net application? Say I have this structure: /admin /customer /login-admin.aspx /login-customer.aspx I have 2 different login forms. One for the admin people and one for the customers (the forms are different as the customers need to provide extra information on their login page). In the authentication section of the webconfig file (which is at the root of the web app), I can only specify one Login page. So how can I make sure thaf if anyone tries to access a webpage in /admin they will be redirected to /login-admin.aspx and if they try to access a webpage in /customer they will be redirected to /login-customer.aspx ? Thanks, Anthony

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• Why is e.Item.DataItem null on ItemDataBound event when binding an asp:net Repeater to a Collection?

  - by Clean

  Hi, I'm trying to bind a collection implementing the ICollection, IEnumerable and IList interface to an asp.net repeater. The Collection is named CustomCollection. So I'm setting the datasource of the repeater to the collection, as follows: rptRepeater.DataSource = customCollection; rptRepeater.Databind(); Then, on the ItemDataBound event, I'm trying to access the DataItem object, as follow: void rptRepeater_ItemDataBound(object sender, RepeaterItemEventArgs e){ object obj = e.Item.DataItem; // DataItem is null for some reason } For some reason the e.Item.DataItem object is null. Do anyone know why this is, and/or what I could do to get hold of the object in the collection that is to be databound to the repeater? Thanx!

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• What is the reverse of GetVirtualPath for asp.net routing?

  - by Fredou

  From a virtualpath, I need to get his name. How can I do this? Since people think that I'm talking about file system here an example of what I need. With asp.net routing you can associate a name to a virtual file linked to a physical file. For an example, I can give the name homeEn to http://mysite.com/home which is linked to the physical file ~/homepage.aspx. What I need is from the virtual file http://mysite.com/home to get back homeEn name.

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• In search of a packaged .Net security solution for web-forms.

  - by Chuck Conway

  We are looking for a security solution for asp.net that has security down to the control level. This is not a necessity but, it would be nice. At the very least it needs to extend-able to allow for control level permissions. The solution should have an administration panel of some sort. It also needs to support roles, groups, and individual permissions. We haven't seen anything like this in the marketplace -- we are in the process of rolling our own solution. We'd rather use an off the shelf solution.

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• Why would an ASP.NET site become veeeeeery slow after the network connection dropped?

  - by Joon

  I have an ASP.NET 3.5 site published in IIS 7.5 on Windows Server 2008 R2 64 bit. The pages are accessed over SSL One of our testers has determined that if, during a postback, he blocks network access on his PC, and then after a few seconds reconnects, our site becomes excruciatingly slow. Like 30 seconds per page load. If he hits the refresh button in his browser it stays slow. If he closes the tab, then re-opens it, it becomes fast again. This behavior happens with both IE 8 and the latest firefox. There are no event log entries on the server when this happens My question: - Has anyone seen this same behavior? - Does anyone have a theory as to what causes it?

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• [ASP.NET] Problems with error: "Access to the path <path> is denied."

  - by Tony

  Hi, I was looking for the the trick to resolve that error (google, stackoverflow.com etc) and every nothing works. I need to dinamically create an .aspx file via the asp.net application. What I've done to try fix it: 1) In the folder's Properties - Security, I've added IUSR_TONY and also IIS_IUSRS and allow them the Full control to the folder. Just to check if that will help. Nope, it won't. 2) in the IIS Manager, I tried to change the Application's Pool Defaults Identity (based on that) I checked all options, with no success I don't know what to do more to fix it. Any ideas ?

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• Can checkboxes be removed from a .NET WinForms ListView at runtime?

  - by James

  Is it possible to remove the checkboxes from a .NET WinForms ListView control at runtime? The following code appears to have no effect when '.Checkboxes' has initially been set to 'true' and the control has rendered onto a form with checkboxes available for each list view item: // C#: testListView.BeginUpdate(); testListView.Checkboxes = false; testListView.EndUpdate(); Is there a method that must be called to enact this change? What is the use of providing the .Checkboxes property when it defaults to 'false' and only has an effect if set to 'true'?

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• .NET Data Providers - How do I determine what they can do?

  - by rbellamy

  I have code which could be executed using a Provider that doesn't support transactions, or doesn't support nested transactions. How would I programmatically determine such support? E.g. The code below throws a System.InvalidOperationException on the final commit when using the MySQL .NET Connector, but works fine for MSSQL. I'd like to be able to alter the code to accommodate various providers, without having to hardcode tests based on the type of provider (E.g. I don't want to have to do if(typeof(connection) == "some provider name")) using (IDbConnection connection = Use.Connection(ConnectionStringName)) using (IDbTransaction transaction = connection.BeginTransaction()) { using (currentCommand = connection.CreateCommand()) { using (IDbCommand cmd = connection.CreateCommand()) { currentCommand = cmd; currentCommand.Transaction = transaction; currentCommand.ExecuteNonQuery(); } if (PipelineExecuter.HasErrors) { transaction.Rollback(); } else { transaction.Commit(); } } transaction.Commit(); }

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• How can I programatically convert SQL data-types to .Net data-types?

  - by Simon

  Can anyone show me a way of converting SQL Server data-types (varchar for example) to .Net data-types (String for example). I'm assuming that automatic conversion is not possible? I have an 'EntityProperty' object and would like it to have an appropriate 'Type' property (string, decimal, int32 etc), at the moment this property is just a string - 'int32' for example. A little background: I'm using SQL DMO in an internal code generation app to query a database and generate a stored procedure based DAL from the database. Being an internal app I can take quite a few shortcuts and make quite a few assumptions. To get the app working at the moment this data-type conversion is handled by a Select Case statement which just converts the types to strings and generates a set of properties based on these strings but I would prefer a little more flexibility in being able to handle the types (use of TypeOf etc). Anyone worked on something similar? I know EF, nHibernate, Subsonic etc could do all this for me but in this case, for various reasons, I am having to roll my own. :)

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• Why use SyncLocks in .NET for simple operations when Interlocked class is available?

  - by rwmnau

  I've been doing simple multi-threading in VB.NET for a while, and have just gotten into my first large multi-threaded project. I've always done everything using the Synclock statement because I didn't think there was a better way. I just learned about the Interlocked Class - it makes it look as though all this: Private SomeInt as Integer Private SomeInt_LockObject as New Object Public Sub IntrementSomeInt Synclock SomeInt_LockObject SomeInt += 1 End Synclock End Sub Can be replaced with a single statement: Interlocked.Increment(SomeInt) This handles all the locking internally and modifies the number. This would be much simpler than writing my own locks for simple operations (longer-running or more complicated operations obviously still need their own locking). Is there a reason why I'd rolling my own locking, using dedicated locking objects, when I can accomplish the same thing using the Interlocked methods?

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• Crystal Report with Error : A number range is required here.

  - by gofor.net

  Hi Everyone, I am using the crystal report, in that i am using code like below to show the SQL data into the crystal report, string req = "{View_EODPumpTest.ROId} IN " + str + " AND " + "({View_EODPumpTest.RecordCreatedDate}>=date(" + fromDate.Year + " , " + fromDate.Month + " , " + fromDate.Day + ")" + "AND" + "{View_EODPumpTest.RecordCreatedDate}<=date(" + toDate.Year + " , " + toDate.Month + " ," + toDate.Day + " ))"; ReportDocument rep = new ReportDocument(); rep.Load(Server.MapPath("PumpTestReport.rpt")); DateTime fromDate = DateTime.Parse(Request.QueryString["fDate"].ToString()); DateTime toDate = DateTime.Parse(Request.QueryString["tDate"].ToString()); CrystalReportViewer_PumpTest.ReportSource = rep; //CrystalReportViewer1.SelectionFormula = str; rep.RecordSelectionFormula = str; CrystalDecisions.CrystalReports.Engine.TextObject from = ((CrystalDecisions.CrystalReports.Engine.TextObject)rep.ReportDefinition.ReportObjects["txtFrom"]); from.Text = fromDate.ToShortDateString(); CrystalDecisions.CrystalReports.Engine.TextObject to = ((CrystalDecisions.CrystalReports.Engine.TextObject)rep.ReportDefinition.ReportObjects["txtTO"]); to.Text = toDate.ToShortDateString(); //Session["Repo"] = rep; CrystalReportViewer_PumpTest.RefreshReport(); after running my application it executes fine with no exception but such error i am getting, A number range is required here. Error in File C:\DOCUME~1\Delmon\LOCALS~1\Temp\PumpTestReport {14E557A7-51B3-4791-9C78-B6FBAFFBD87C}.rpt: Error in formula . '{View_EODPumpTest.ROId} IN ['15739410','13465410'] AND ({View_EODPumpTest.RecordCreatedDate}>=date(2010 , 12 , 1)AND{View_EODPumpTest.RecordCreatedDate}<=date(2010 , 12 ,25 ))' A number range is required here. error. what i will do for this? Please help, Thanks in advance

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• How to add a margin to a CheckedListBox in .NET?

  - by Xanatos

  I'm writing an windforms application using .NET (actually IronPython, but that's not relevant), and I have a CheckedListBox object in my GUI. It's working fine, it has about 20 items in a multicolumn layout. But I can't figure out how to give the thing a nice internal margin--I want to insert around 20 or 30 pixels of whitespace around the top, bottom, left, and right edges of the checkboxes. To be clear, I want the whitespace to appear between the border of the CheckedListBox and the Checkboxes inside it, not outside the whole component. Hopefully this is an easy answer, and I'm just missing it cause I'm new to programming in windows. If its not possible, I guess that'd be good to know too, so I don't waste anymore time with it. (If I were doing this in Swing (Java) I would be looking to set the Insets on my component, or maybe build up a compound border with some empty space in it.)

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• Compilation error on a user control

  - by MikeP

  I'm stumped! We have a user control for managing account information. We use this particular control on two pages. On one page, everything works perfectly and meets our expectation. On the second page however we receive compilation errors stating that: "C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\lrpcentral\0e987bea\6719c8b6\App_Web_PageThatFails.aspx.f3d462c1.oi52bvii.0.cs(172): error CS0433: The type 'xxxx_ascx' exists in both 'c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\APPLICATIONNAME\0e987bea\6719c8b6\App_Web_xxxx.ascx.cdcab7d2.xbnvt2za.dll' and 'c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\APPLICATIONNAME\0e987bea\6719c8b6\App_Web_eix7xllr.dll' My problem is similar to Cyril's but the "delete everything from Temp" is not an option for me, and Cyril's solution does not apply since the only variable we have is contained in the designer file, which is not deployed to our production environment (we pre-compile). After reading David's answer (here) I examined my directories for circular dependency and was unable to find any. Structure: Top Level Page that works Control Directory A Page that causes the error

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