DataTable dt = new DataTable();

            dt.Columns.Add("Id", typeof(int));

            dt.Columns.Add("Nu", typeof(int));

            Random r = new Random(DateTime.Now.Millisecond);

            //DataTable 去重

            for (int i = ; i < ; i++)

            {

                dt.Rows.Add(r.Next(, ),);

            }

            dt.Rows.Add();

            DataView dv = new DataView(dt);

            dt = dv.ToTable(true, new string[] {"Id","Nu"});    //对Id，Nu 进行过滤，true表示使用distinct方法

            foreach (DataRow item in dt.Rows)

            {

                Console.WriteLine(item["Id"].ToString());

            }