How to find out what code in a C# .NET assembly is not being called -

I have the C # .NET assembly in Visual Studio 2008. If necessary, I can upgrade it in VS 2010.

How can I get what code is not called in the assembly? Ideally if one can analyze the whole solution in a solution.

The assembly is shared between the customer and the server project so I need to understand which code is used.

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