How To Sort Datatable in c#.net

            DataTable _dt = new DataTable();
            _dt.Columns.Add("Date", typeof(DateTime));
            _dt.Columns.Add("Preferance", typeof(int));
 
            _dt.Rows.Add("30/07/2011", 0);
            _dt.Rows.Add("02/03/2011", 1);
            _dt.Rows.Add("10/12/2011", 2);
            _dt.Rows.Add("01/12/2011", 3);
 
            DataView _dv = new DataView(_dt);
            _dv.Sort = "Date ASC";
 
            for (int i = 0; i < _dv.Count; i++)
            {
                Console.WriteLine(Convert.ToDateTime(_dv[i]["Date"]).ToString("dd/MM/yyyy") + "\t" + _dv[i]["Preferance"]);
            }

dt.DefaultView.Sort = "Parameter_Name";
dt = dt.DefaultView.ToTable();