private void sessionType_SelectedIndexChanged(object sender, EventArgs e)
        {
            roomsConn roomsConn           = new roomsConn();
            String    selectedSessionType = sessionType.Text.ToString();

            asubjectCode.DataSource = roomsConn.getSessionTypeTable(selectedSessionType);
            if (selectedSessionType.Equals("Normal"))
            {
                atag2.Hide();
                label1.Hide();
                roomManagingSource.DataSource = roomsConn.load_normal_sesssion_details();
            }
            else
            {
                atag2.Show();
                label1.Show();
                // comboBox1.Show();
                // label7.Show();
            }
            if (selectedSessionType.Equals("Normal"))
            {
                roomManagingSource.DataSource = roomsConn.load_normal_sesssion_details();
            }
            else if (selectedSessionType.Equals("Consecutive"))
            {
                roomManagingSource.DataSource = roomsConn.load_con_sesssion_details();
            }
            else if (selectedSessionType.Equals("Parallel"))
            {
                roomManagingSource.DataSource = roomsConn.load_parallel_sesssion_details();
            }
        }