C#
An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.
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I'm a c# beginner. I create a WpfControlLibray. In my concept, the project name contains the word "Library" and it should have more than one control. After I rename "UserControl1" to "XLabel", the design window is enclosed by red lines. Could anybody tell me how to proceed?