virtual path providers to dynamically load and compile content from virtual paths in ASP.NET 2.0

extend ASP.NET by providing virtual access to content and files for compilation in ASP.NET 2.0. This feature can be used to create applications similar to Microsoft SharePoint Portal Server, where the content is stored in a database instead of on the physical file system. 

refer to this article with sample code for details http://support.microsoft.com/kb/910441.