Gets a reference to a previously registered System.Web.Hosting.VirtualPathProvider object in the compilation system.
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When a System.Web.Hosting.VirtualPathProvider object is registered with the ASP.NET compilation system, it is added to a chain of providers. Use the VirtualPathProvider.Previous property to hand processing off to the previous System.Web.Hosting.VirtualPathProvider object in the chain if the requested path is not provided by this System.Web.Hosting.VirtualPathProvider instance.
The chain of path providers always ends with the default ASP.NET provider, which serves files from the file system.