private void StudentHome_Load(object sender, EventArgs e)
        {
            metroLabelUser.Text = Login.u; //logged in user name
            StudentTransactions st = new StudentTransactions();

            s     = st.getStudentId(metroLabelUser.Text); // get user id
            stdId = s.getid();
            //execute methods onload
            loadCombo();
            loadComboShowMods();
            loadComboTab();
        }
        void loadComboTab()
        {
            StudentTransactions std = new StudentTransactions();

            std.getStudentId(metroLabelUser.Text);
            String              stid = s.getid();
            DataRow             dr;
            CommonDBTransaction c   = new CommonDBTransaction();
            string              sql = "SELECT mid FROM StudentModule WHERE sid = '" + stid + "'";
            DataTable           dt  = c.searchData(sql);

            if (dt.Rows.Count > 0)
            {
                dr           = dt.NewRow();
                dr.ItemArray = new object[] { "--Select Module--" };
                dt.Rows.InsertAt(dr, 0);
                metroComboBoxModl.ValueMember   = "mid";
                metroComboBoxModl.DisplayMember = "mid";
                metroComboBoxModl.DataSource    = dt;
            }
        }