SharePoint 2010: Debugging Visual Studio 2010

Method I:

1. Go to “Debug” and select “Attach to Process”
2. Make sure “Show processes in all sessions” checkbox is checked
3. Select all “w3wp.exe” processes and click on “Attach” button

If it does not work,

1. Go to “Debug” and select “Attach to Process”
2. Click on “Select…”.”Select Code Type” window will appear
3. Select “Debug these codes types” and check “Managed (v2.0, v1.1, v1.0)” only

Method II:

1. Write “System.Diagnostics.Debugger.Launch()” in the code where you want to attach debugger
2. When you run the code, a popup window will appear asking for attaching debugger.
3. Click “Yes” and guide to appropriate instance of Visual Studio

Method III:

Use third party software like:

1. Visual Studio 2010 extension for helping SharePoint 2010 debugging

 

Fuente:

http://farhanfaiz.wordpress.com/2012/02/07/sharepoint-2010-debugging-visual-studio-2010/