private void miQLNgheNghiep_Click(object sender, EventArgs e)
 {
     if (this.frm_NgheNghiep == null || this.frm_NgheNghiep.IsDisposed)
     {
         frm_NgheNghiep           = new frmNgheNghiep();
         frm_NgheNghiep.MdiParent = this;
         frm_NgheNghiep.Show();
     }
 }
        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btThemNgheMe_Click(object sender, EventArgs e)
        {
            int           chaSelectednIndex = this.cmbNNghiepCha.SelectedIndex;
            frmNgheNghiep frm_NgheNghiep    = new frmNgheNghiep(this.NgheNghiepMeController);

            frm_NgheNghiep.ControlBox  = false;//Khong cho hien thi nut "X" tren thanh tieu de
            frm_NgheNghiep.WindowState = FormWindowState.Normal;
            if (frm_NgheNghiep.ShowDialog() == DialogResult.OK)
            {
                this.NgheNghiepChaContorller.Data.LayDS();
                this.cmbNNghiepCha.SelectedIndex = chaSelectednIndex;
            }
        }