BizTalk upgrade issue – Missing Assembly.cs file

All BizTalk solutions from 2006R2 was upgraded to 2010 version and was checked-in to TFS couple of months back and today I try to get the latest version and tried to compile it and boom! it throws an error.

It seems that when you use the upgrade wizard and try to check-in (TFS), the Assembly.cs file is being ignored.

To solve this I went to the copy of the solution (or History if not available) and copy every Properties folder (which contains the Assembly.cs) to the new one.

Finally in the Source Control, I selected the top folder then click Add Items to the Folder -> Sort it by Name -> Exclude all that is not Assembly.cs -> Finish.

Lesson of the day:  to always check whether the Assembly.cs is included during the checkin when migrating a BizTalk solution.


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