implementation of a webusercontrol

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ASP.NET

I am working on a web application BOOK NOW where most of the dynamic part is inside a modalpopup. the same modalpopup is used in every pages. So i think to put that modalpopup content into a webuser control and call that control from a each page. So code can be reused and no need to write the same code every time in the same application.
Can anyone please guide me how to call webuser control from an aspx page.

Thanks in advance.