private void btnThem_Click(object sender, EventArgs e)
        {
            Forms.frmTheLoai frmTL = new Forms.frmTheLoai();

            frmTL.myEvent += frm_myEvent;

            frmTL.ShowDialog();
        }
 private void btnChinhSua_Click(object sender, EventArgs e)
 {
     try
     {
         string _maTL = grid_TheLoai.GetRowCellValue(grid_TheLoai.FocusedRowHandle, grid_TheLoai.Columns["MaTL"]).ToString();
         
         // Truyen cai MaTL vua lay dx...qua ben form NhapTheLoai.
         Forms.frmTheLoai frmTL = new Forms.frmTheLoai(_maTL);
         frmTL.myEvent += frm_myEvent;
         txtTim.Text = "";
         frmTL.ShowDialog();
     }
     catch
     {
         XtraMessageBox.Show("Bạn phải chọn dòng chưa dữ liệu", Text, MessageBoxButtons.OK, MessageBoxIcon.Error);
     }
 }