File (or assembly) can't be found after changing project's .NET target-framework from 4.0 to 3.5

Question

I want to change my C# project, which is based on the .NET 4.0 to 3.5. So I changed the project\'s target-framework to 3.5.

After re-opening and trying to compile the pr

Answer 1

That reference is pointing to .Net 4 - you need to remove all .net 4 references and then readd them using the .net 3.5 version of the assemly and then it will work

paul