In Visual studio under the project click propeties.
Then select the build events and then the post build event command line
Enter:
CALL "%VS80COMNTOOLS%\vsvars32.bat" > NULL
gacutil.exe /if "$(TargetName)"
f65c31f9-d38e-43e9-8cd1-6fa38b92ef19|0|.0
Visual Studio .NET 2005
gac, build events