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How do you register a user control?
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In the containing ASP.NET Web page, create an @ Register directive that includes:
A TagPrefix attribute, which associates a prefix with the user control. This prefix will be included in opening tag of the user control element.
A TagName attribute, which associates a name with the user control. This name will be included in the opening tag of the user control element.
A Src attribute, which defines the virtual path to the user control file that you are including.