C# create a new GUID

If you need a new GUID (not in code) and have MS Windows SDK installed, you can type this in the cmd prompt:
uuidgen
which will give you something like this:
C:\>uuidgen
ff9ddb07-bf8e-4f90-9475-8715c061231c

If you need to do this at runtime in .Net, see System.Guid.

System.Guid guid=System.Guid.NewGuid();
Console.WriteLine(guid.ToString);