Migration Cuda 4.2 to Cuda 5.0 from Visual Studio 2010

I just installed Cuda 5.0 for Visual Studio 2010. I can create Cuda 5.0 new project in VS2010. As I have all current projects in Cuda 4.2, which need to upgrade to Cuda 5.0. What is the easy way to upgrade and convert it to Cuda 5.0?