We all make mistakes and its always helpful to get a second opinion. You need to enable debugging for either errors in our code or wanting to see the execution.

Debugging is a programmers best friend and a bug’s worst enemy.

To enable ASP.NET debugging

1. Browse to the set of virtual directories for Windows SharePoint Services. Just remember, you cannot access the web.config file via your web browser as security restrictions set by IIS.
   

   For example, c:\Inetpub\wwwroot\wss\VirtualDirectories.

2. For each virtual directory
   1. Open the web.config file contained in the virtual directory.
   2. Change <compilation batch=”false” debug=”false“> to <compilation batch=”false” debug=”true“>.
   3. Change <customErrors mode=”On“/> to <customErrors mode=”Off“/>
   4. Change <SafeMode MaxControls=”200″ CallStack=”false” …/> to <SafeMode MaxControls=”200″ CallStack=”true” …/>
   5. Save the web.config file.
3. Open a command prompt and type iisreset to restart the server.

References:

• Windows SharePoint Services 3.0 Tools: Visual Studio 2005 Extensions
• How To: Enable Debugging for ASP.NET Applications
• The Microsoft .NET Framework SDK Debugger