uniqueidentifier Equivalent DataType In C#

what is uniqueidentifier (Sql server 2005) equivalent in C# 3.5 data开发者_运维问答type ?

It should be System.Guid or Nullable<Guid>

System.Guid.NewGuid()

Use System.Guid

Example :

    public string CustID { get; set; }

    public System.Guid ActivationCode { get; set;}