Application Directory Structure : Directory Structure « ASP.Net Instroduction « ASP.NET Tutorial

ASP.NET defines a few directories with special meanings.

Directory           Description 
Bin                 Contains all the precompiled .NET assemblies usually DLLs
App_Code            Contains source code files that are dynamically compiled for use
App_GlobalResources stores global resources 
App_LocalResources  resources are accessible for their dedicated page only
App_WebReferences  Stores references to web services that the web application uses. 
                    This includes WSDL files and discovery documents. 
App_Data            reserved for data storage
App_Browsers        browser definitions stored in XML files
App_Themes          themes used by the web application

1.2.Directory Structure
1.2.1.Application Directory Structure
1.2.2.ASP.NET Application Folders
1.2.3.ASP.NET Page Directives
1.2.4.directives in ASP.NET
1.2.5.@Page directive
1.2.6.Page Directives, code section and layout