Difference between User Control and Custom Control

User Controls

Custom Controls
User Controls are easy to use. Custom Controls are difficult to use.
it has limited support. it has full support.
It can be used within same project It can be used across many project
A separate copy of the control is required in each application. Only a single copy of the control is required, in the global assembly cache.
Can not be added to the Toolbox. Can be added to the Toolbox.
Good for static layout. Good for dynamic layout.
User controls provide less flexibility than Custom controls. Custom controls provide flexibility than User controls.

System.Windows.Controls.Control

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System.Windows.Controls.UserControl

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Custom.UserControl

System.Windows.Controls.Control

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Custom Control