Guid guid1 = Guid.NewGuid();

            Guid guid2 = Guid.NewGuid();

            IList<Guid?> listnull = new List<Guid?>()

            {

               guid1,

               guid2

            };



            List<Guid> list = listnull.Select(x => x.Value).ToList();

            list.ForEach(x=>Console.WriteLine(x.ToString()));