Web Reference: Jul 22, 2010 · I'm getting a: type or namespace name could not be found error for a C# WPF app in VS2010. This area of code was compiling fine, but suddenly I'm getting this error. The type 'type' is defined in an assembly that is not referenced. You must add a reference to assembly 'assembly'. This error occurs when you try to use a specific class or namespace (e.g., System.Windows.Forms) but the compiler cannot find it. Even if you have the using directive at the top of your file, the compiler needs to know where that namespace physically lives (which DLL or Project contains it).
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