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... trying to do .NET 2.0 Windows Form Application in C# Express VS2008...
Well, so far all I've found is the Empty Project will let you downgrade to target .NET 2.0. Only thing is then I have to add a form, then add a code file, then paste in some generic Program.cs code to run Form1. Man this is really lame!!
In case anyone else runs into this, just create your default Windows Form Application, and save before doing any customization. Open Project Properties and change the drop down list to target 2.0 or 3.0. Then in the Solution Explorer references delete the linq references and the data extension references(at least for .NET 2.0 target). Now in Form1.cs and Program.cs delete the using statements that refer to linq or data. Save and it should stop giving warnings and errors. To confirm just build as a form that closes when you click the 'x' on the window frame. If that compiles you should be good to go. Once you know exactly what to change it only takes a minute.