Howto enable performance profiling on IIS and VS2008

If you are using VS2008/2010 and you need to profile your code you can have the warning:

The profiling environment for ConsoleApplication2 is not set up correctly. Use vsperfclrenv.cmd to setup environment variables. Continue anyway?

The solution is to execute the vsperfclrenv.cmd located under:

C:\Program Files\Microsoft Visual Studio 9.0\Team Tools\Performance Tools>vsperfclrenv.cmd /globalsampleon

using the globalsampleon option.