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

            frmDS.myEvent += frm_myEvent;

            frmDS.ShowDialog();
        }
        private void btnChinhSua_Click(object sender, EventArgs e)
        {
            try
            {
                string _mads = grid_DauSach.GetRowCellValue(grid_DauSach.FocusedRowHandle, grid_DauSach.Columns["MaDS"]).ToString();

                // Truyen cai MaTL vua lay dx...qua ben form NhapTheLoai.
                Forms.frmDauSach frmDS = new Forms.frmDauSach(_mads);
                frmDS.myEvent += frm_myEvent;
                txtTim.Text = "";
                frmDS.ShowDialog();
            }
            catch
            {
                XtraMessageBox.Show("Bạn phải chọn dòng chứa dữ liệu", Text, MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }