A GUID is a unique identifier that you can use as a reference since its always unique.
If you need a GUID without writting any code, then visit Get-A-GUID.com which will generate a GUID for you everytime you refresh the webpage.
The code below create a GUID in C# and then display it to the console window:
static void Main(string args)
System.Guid id = System.Guid.NewGuid();
You can also store a GUID to a database, more about that in a future post :-)
PS: Been hectic at work, will write more later.