Gets a value that indicates whether a file exists in the virtual file system.
Assembly: System.Web (in System.Web.dll)
Override the method to indicate to the compilation system that the resource represented by virtualPath exists in the virtual file system provided by this VirtualPathProvider instance.
The following code example is an implementation of the method in a custom VirtualPathProvider class. For the full code required to run the example, see the Example section of the VirtualPathProvider class overview topic.