You can add the following files to Visual Studio source control:
Solution files (*.sln).
Project files, for example, *.csproj, *.vbproj files.
Application configuration files, based on XML, used to control run-time behavior of a Visual Studio project.
Files that you cannot add to source control include the following:
Solution user option files (*.suo).
Project user option files, for example, *.csproj.user, *.vbproj.user files.
Web information files, for example, *.csproj.webinfo, *.vbproj.webinfo, that control the virtual root location of a Web project.
Build output files, for example, *.dll and *.exe files.