/// <summary>
 ///
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void cmbLop_SelectedIndexChanged(object sender, EventArgs e)
 {
     if (this.cmbLop.SelectedIndex != -1)
     {
         LopController lopCtrl = new LopController();
         LopInfo       lopInfo = lopCtrl.LayTuMa(((DataRowView)this.cmbLop.SelectedItem).Row.ItemArray[0].ToString());
         this.MonHocController.HienThiDS(this.lvDMMonHoc, lopInfo);
         this.LopMonHocController.HienThiDS(this.lvDSMonHocDuocChon, lopInfo);
     }
 }
        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void botBoQua_Click(object sender, EventArgs e)
        {
            this.cmbNamHoc.Enabled  = true;
            this.cmbKhoiLop.Enabled = true;
            this.cmbLop.Enabled     = true;

            LopController lopCtrl = new LopController();
            LopInfo       lopInfo = lopCtrl.LayTuMa(((DataRowView)this.cmbLop.SelectedItem).Row.ItemArray[0].ToString());

            this.MonHocController.HienThiDS(this.lvDMMonHoc, lopInfo);
            this.LopMonHocController.HienThiDS(this.lvDSMonHocDuocChon, lopInfo);
        }