The System.Web.UI.VirtualReferenceType enumeration describes the type of resource referenced by a virtual path. The System.Web.UI.VirtualReferenceType is determined from the parsed extension of the resource.
Page and control developers do not use the System.Web.UI.VirtualReferenceType enumeration directly. Extensibility developers might use the System.Web.UI.VirtualReferenceType enumeration when extending the System.Web.UI.PageParserFilter class and overriding its PageParserFilter.AllowVirtualReference(string, VirtualReferenceType) method.