public DataTable Query(string sqlstring)
        {
            try
            {
                mobjConn = new SqlConnection(mstrConn);
                mobjCmd = mobjConn.CreateCommand();
                mobjCmd.CommandText = sqlstring;
                DataTable dt_return = new DataTable();

                mobjConn.Open();
                SqlDataReader reader = mobjCmd.ExecuteReader();
                dt_return.Load(reader);
                return dt_return;
            }
            catch (SqlException e)
            {
                throw e;
            }
            finally
            {
                mobjConn.Close();
            }
        }

        public DataTable Query(string sqlstring)
        {
            try
            {
                DataTable dt_return = new DataTable();

                mobjAdapter = new SqlDataAdapter(sqlstring, mstrConn);
                mobjAdapter.Fill(dt_return);

                return dt_return;
            }
            catch (SqlException e)
            {
                throw e;
            }
        }