Tutorial by Topics: usercontrols

Note that a UserControl is very different from a Control. One of the primary differences is that a UserControl makes use of a XAML layout file to determine where to place several individual Controls. A Control, on the other hand, is just pure code - there's no layout file at all. In some ways, cre...

User controls are containers which can be populated with HTML markup & server controls with code-behind in the same way as ASPX page. They're treated as reusable smaller units of a page, so they can't run as stand-alone pages and must not having html, body or form HTML elements in them.