User controls are coupled with the application they are created for and thus cannot be reused in other applications. When creating your widget as a user control, you do not have to create additional projects and add them to the solution, because the development of the widget only takes place in Sitefinity CMS application's project.
First, you create an empty user control inside your application structure. Then, you extend it and implement the widget features in the user control. To do this, you must use the Web User Control template, provided by Visual Studio.
To create a user control:
In the dialog, click Visual C# » Web » Web User Control.
Name the control NewsRotator.ascx and click Add.
As a result, the empty user control is generated in UserControls folder.
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