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The .sln: The solution file provides a display for the solution explorer manage file graphics information required interfaces.
.csproj: Project files, create the desired application references, data connections, information folders and files.
.aspx: Web Forms page consists of two parts: the visual elements (HTML, server controls, and static text) and programming logic page. Visual Studio these two components are stored in a separate file. Visual elements created in the .aspx file.
.ascx: ASP.NET user controls (also called "pagelets"), is packaged as a specific function and behavior (both of which are to be used on various pages of the Web application) of the Web page being developed . A user control contains a combination of HTML, or other Web code and user control, and save your file format on a Web server, its extension is * .ascx. ASP.NET in the default configuration does not allow the Web client to access these files by URL, but other pages of this site can integrate the functionality of these files contain.
.aspx.cs: programming logic Web Forms pages in a single class file, the file is called the code behind class files (.aspx.cs).
.cs: class module code file. Business logic of the code layer processing.
.asax: Global.asax file (also known as the ASP.NET application file) is an optional file that contains the response code application-level event of the ASP.NET HTTP module or triggered.
.config: Web.config file provides configuration information to the directory they are located and all subdirectories.
.aspx.resx / .resx: resource file, resources are any non-executable data logically deployed by the application. By storing data in the resource file, without having to recompile the entire application to change the data.
.XSD: one kind of XML schema development from DTD, XDR to XSD.
.Pdb: PDB (program database) files maintained commissioning and project status information, which can be incremental linking of debug configuration program.
.suo: Solution user options, all options will be recorded associated with the solution, so that every time you open it contains custom settings you have made.
.asmx: asmx: WebService file contains processing instructions, and used as XML Web services addressable entry point.