GUID (Global Unique Identifier) - A GUID is a unique reference number used as an identifier in computer software. GUIDs are usually stored as 128-bit values, and are commonly displayed as 32 hexadecimal digits with groups separated by hyphens, such as 21EC2020-3AEA-1069-A2DD-08002B30309D.
public static void Main(string args)
Guid g = Guid.NewGuid();
Console.WriteLine("GUID: " + g.ToString());