How to add a reference to assembly in C#? [duplicate]

Question

I am getting the error:

the type 'system.windows.controls.control' is defined in an assembly that is not referenced".

How to add a reference to assembly?

Answer 1

For completeness, and in the unlikely event that you are not using Visual Studio (which you didn't specify), you can add assembly references to csc using the /r: compiler option. Likewise with the <References> element of the <Csc> task in msbuild.

Answer 2

Solution Explorer > References (Rigth-click) > Add Reference

Search for System.Windows and add it to your references.

Also see the documentation: How to: Add or Remove References By Using the Add Reference Dialog Box