1.The Web. Config file can be only placed in the root of a Web Site to override settings in theMachine.Config file for all applications in a particular Web Site
2.The Web. Config file can only be placed in the root of a particular virtual directory
3.The Web. Config file can be placed in the root of the Web Site and the root of a virtual directory. The settings from the file in the virtual directory overrides the settings from the file in the Web
4.The Web. Config file can be placed in the root of the Web Site and the root of a virtual directory and in any subdirectory of an application. The settings from a file at a particular level override th