How to: Upgrade Projects Created in Earlier Versions of Visual Studio
Use these steps to convert a solution or project that was created in earlier versions of Visual Studio to the format that is used by Visual Studio 2010.
To upgrade a project
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.
In the Open Project dialog box, select a project file, and then click Open.
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 information about how to troubleshoot failed upgrades, see Troubleshooting Unsuccessful Project Upgrades.