How to: Upgrade Projects Created in Earlier Versions of Visual Studio
You can use these steps to convert a solution or project that was created in an version of Visual Studio to the format that is used by the current version.
To upgrade a project that was created in an earlier version of Visual Studio
In Visual Studio, on the File menu, click Open and then click Project/Solution, Web Site, or File, depending on the kind of project you are upgrading.
Select a .vcproj, .vbproj, .csproj, .vjsproj, or .sln file, and then click OK.
If Visual Studio detects that the project or file was created in an earlier version of Visual Studio, the Visual Studio Conversion Wizard opens.
Complete the Visual Studio Conversion Wizard.
For more information about how to use the Visual Studio Conversion Wizard and how to handle failed upgrades, see Visual Studio Conversion Wizard.