To have a convenient folder and file structure help web developers and designers to manage their web application in a efficient manner. With the release of .Net Framework 2.0, ASP.net reserves the some folder names, so developers can put special files in these folders.

App_Browser 

ASP.net reserve this folder name for storing browser definition files. Browser definition files are used to determine the client browser capabilities. Browser definition files have .browser extension.

App_Code

App_code folder can contain source code for utility classes as well business objects. Classes that are present in App_Code folder are automatically complied when your web application complied. Arbitrary file types can be placed in the App_Code folder to create strongly typed objects. For example, placing Web service files (.wsdl and .xsd files) in the App_Code folder creates strongly typed proxies. Code present in App_Code is automatically referenced by ASP.net Application.

App_Data

App_Data is used to store file that can be used as database files including MDF files, XML files, as well as other data store files. App_Data folder is used by ASP.net application for storing ASP.net application local database. Developers can also use this folder for storing data for their ASP.net Application.

App_GlobalResources

App_GlobalResources folder contains resources files that are complied into assemblies and these assemblies are available in Global scope. Resource files are strongly typed and can be accessed programmatically.

App_LocalResources

App_LocalResources folder also contain the same files that are being contained by App_GlobalResources  but files located in this folder are only available to a particular project, web page, master page or web user control.

App_Themes

App_Themes folder used by ASP.net to store files that are being used to define the look and feel of web application. App_Themes folder store skin, CSS and image files. Skin files are files have .skin file extension.

Bin

Bin folder contains complied assemblies(.dll) files for web user controls, classes or for components.

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