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.NET FAQ collection

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ASP.NET FAQ

3. Debugging and Error Handling

3.1 Why do I get Error message "Unable to Start Debugging" Error Message When You Send Debug HTTP Request?
3.2 Why do I get the error message "Unable to start debugging on the web server..." when I debug?
3.3 When I Debug ASP.NET Applications I get error message "Access Is Denied. Check the DCOM Configuration Settings for the Machine Debug Manager"?
3.4 On Trying to Debug an application, by the F5 key I get the error: "Error while trying to run project: Unable to start debugging on the web server. Catastrophic failure"?
3.5 How to configure my project for debugging ASP Code?
3.6 In Visual Studio .NET, whenever I try to debug my ASP.NET application I'm not able to stop the debugger on my breakpoints. Why?
3.7 Why do I get error message "Unable to start debugging on the web server. The debugger is not properly installed. Run setup to install or repair the debugger. Would you like to disable future attempts to debug ASP.NET pages for this project ? "?
3.8 How do I debug JavaScript and other script code in my application using Visual Studio .Net?
3.9 What are the different exception-handling approaches that can be used in ASP.NET?
3.10 Why do I get error message "Login failed for user '(null)'. Reason: Not associated with a trusted SQL Server connection"?
3.11 Why do I get the Error Message "System.OutOfMemoryException: Exception of type System.OutOfMemoryException was thrown."?
3.12 Why do I get the error message "Sql Server does not exists or access denied " whenever I try to access the data on Sql server?
3.13 Why do I get error message "It is already opened exclusively by another user, or you need permission to view its data." when I try to open Access mdb?
3.14 Why do I get the "HTTP 404 - File not found." error message as "The page cannot be found.The page you are looking for might have been removed, had its name changed, or is temporarily unavailable "?
3.15 When I install the Microsoft .NET Framework 1.1 on a computer that is running Windows XP, and then you start Windows, the Welcome screen appears. This screen prompts me to click your user name to start Windows.Why?
3.16 Why do I get the error message "System.InvalidOperationException: Application is restarting"?
3.17 How can I see the Trace messages?
3.18 I have installed ASP.NET hotfix and I find that Startup Type of the ASP.NET Session State Service is set to Manual.Why?
3.19 Why do I get the error message "aspnet_wp.exe (PID: XXXX) was recycled because it was suspected to be in a deadlocked state "?
3.20 How to display errors using Page_Error event of Page Object?
3.21 How to redirect the user to the friendly error-handler page when an Application error occurs?
3.22 How to Enable Remote Debugging on Windows XP Service Pack 2?
3.24 Why do I get the error message "A potentially dangerous Request.Form value was detected from the client "?
3.25 How can I test performance of the Web application?
3.26 How can I resolve the error message "Cannot access file '...' because it is being used by another process"?
3.27 Why do I get the Compiler Error Message: "CS0246: The type or namespace name '...' could not be found (are you missing a using directive or an assembly reference?) "?
3.28 Why do I get the error message "Compiler Error Message: CS1595"?
3.29 I get error message at runtime "Value null was found where an instance of an object was required" when using Application state variables. why?
3.30 I installed Windows 2003 Standard Edition, then VS.NET and SQL Server 2K with SP3. When I build web project connecting to the database in VS.NET, the compliler gives me the following error:Login failed for user 'NT AUTHORITY\NETWORK SERVICE',why?
3.31 Why do I get error message "System.Threading.ThreadAbortException: Thread was being aborted" while using Response.Redirect?
3.32 Why do I get the error message "BC30451: Name 'ConfigurationSettings' is not declared"?
3.33 What is a parser error?
3.34 Whenever I browse to one of my ASP.NET web pages, Internet Explorer keeps on asking me if I want to download it, or it just displays the ASPX source. Why?
3.35 Why am I getting the error: "Type '(OleDb or SQL)Connection' is not defined."?
3.36 Why do I get the Error message "Operation must use an updateable query"?
3.37 When compiling I get "Could not copy temporary files to the output directory" or "The process cannot access the file because it is being used by another process" error messages. Why?
3.38 Why do I get error message "Failed to Start Monitoring Directory Changes" when i try to browse ASP.NET page?
3.39 Why do I get Compilation error "<Control> is not a member of <Page>"?
3.40 How to see the Message in the Output window using ASP.NET?
3.41 How can I use Tracing in Custom Components?

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