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How to prevent little black boxes not to be displayed in Simulator.

Disable Visual Studio  extra debug option
Try unchecking this option:
Tools > Options > Debugging > General > Enable UI Debugging Tools for XAML > Show runtime tools in the application

This will help in getting good screenshots because the little black boxes are displayed in Simulator.

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Following sample uses the Control class that is a standard class within the System.Windows.Forms namespace. The DLL containing this namespace is automatically included in Windows Forms applications. The class includes a method named IsKeyLocked, which allows you to determine whether keys such as Caps Lock are switched on or off. To check the status of the Caps Lock key, you can use the method in the following manner:

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