Notifies an HtmlTextWriter object, or an object of a derived class, that a control is about to be rendered.
Assembly: System.Web (in System.Web.dll)
The HtmlTextWriter class implementation of the method has no functionality. You must override the method in a class derived from HtmlTextWriter to provide your own rendering functionality. For example, in a markup language that might require <p> elements to be rendered immediately ahead of a control, but where the need for the <p> element is determined earlier, you could use the override.