oop - Anyone able to help move a C# framework 4.5 class library to a compatible framework with XNA 4.0? -

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i've been working class library built against .net 4.5, , in middle of development had move view of project xna. i'm running compatibility errors between view , model. know how change version of .net existing project? creating new project seems less ideal flipping switch somewhere in options.

i solved problem, merely switching framework .net 4.0, in properties pane. don't believe using specific 4.5.


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