private void aroomType_SelectedIndexChanged(object sender, EventArgs e)
        {
            roomsConn roomsConn = new roomsConn();

            String selectedLabNme      = aroomType.Text.ToString();
            String selectedSessionType = sessionType.Text.ToString();

            atags.DataSource = roomsConn.getSessionType(selectedLabNme, selectedSessionType);
        }
        private void asubjectCode_SelectedIndexChanged(object sender, EventArgs e)
        {
            roomsConn roomsConn          = new roomsConn();
            String    getSelectedSubject = asubjectCode.Text.ToString();
            String    getSelectedSession = sessionType.Text.ToString();

            atags.DataSource = roomsConn.getSessionType(getSelectedSubject, getSelectedSession);
            //  atag2.DataSource = roomsConn.getTag2Type(getSelectedSubject, getSelectedSession);

            String selectedSessionType = sessionType.Text.ToString();
            String selectedSubject     = asubjectCode.Text.ToString();

            atags.DataSource = roomsConn.getSessionTypeTag(selectedSessionType, selectedSubject, aroomType.Text.ToString());
        }