public DataSet SQL_Select(string Select_String, SqlConnection Link_Conn)
        {
            DS = new DataSet();
            DT = new DataTable();
            if (Link_Conn == null) Link_Conn = SQL_Conn;            
            try
            {
                DA = new SqlDataAdapter(Select_String, Link_Conn);
                DS.Clear();
                DA.Fill(DS);
            }
            catch (Exception err)
            {
                try
                {
                    int num = err.ToString().IndexOf("。");
                    MessageBox.Show(err.ToString().Substring(0, num));
                }
                catch { }
            }
            Link_Conn.Close();
            return DS;
        }
control.datasource=ds.tables[0];