Here’s something helpful. If you want to generate a random GUID (perhaps for unit testing), you can easily do this from the Visual Studio 2013 tools menu. Click on Tools –> Create GUID to open up the “Create GUID” options window.
There are many different GUID formats so choose the one that suits you. I selected option 4 which generates a basic GUID inside curly braces. Click on the Copy button and you’re away laughing!