Working with helper .net classes with BizTalk is a common task.
Sometimes it can be easy to forget to GAC the latest version of the code when you go to test the solution on your local development box. With a simple Post Build Event, you can have your code automatically put in the GAC for you.
Adding the post build event is easy. Just go to the project properties of your helper class and select Build Events.
Enter the following under Post Build Event:
"C:\Program Files\Microsoft Visual Studio 8\SDK\v2.0\Bin\gacutil.exe" /i $(TargetPath)
Now when you build your code your dll will be GACed for you.