Overrides the target URL for the current request.
Assembly: System.Web (in System.Web.dll)
The method returns a null reference (Nothing in Visual Basic) unless it is overridden in a class that is derived from the DefaultHttpHandler class.
The method is called only if ASP.NET is running in worker process isolation mode on IIS 6.0, and if the response was not modified before the DefaultHttpHandler object was called. The response is modified by any of the following: