private void dgvHienThi_CellClick(object sender, DataGridViewCellEventArgs e)
{
int masv = int.Parse(dgvHienThi.CurrentRow.Cells[0].Value.ToString());
BAL_SINHVIEN bal_sv = new BAL_SINHVIEN();
DataTable dt = bal_sv.getSinhVien_MaSV(masv);
DataRow dr = dt.Rows[0];
txtMaSV.Text = dr["MaSV"].ToString();
txtHoten.Text = dr["HoTen"].ToString();
txtDiaChi.Text = dr["DiaChi"].ToString();
dtpNgaySinh.Value = DateTime.Parse(dr["NgaySinh"].ToString());
//txtHoten.Text = dr["MaLop"].ToString();
cbLop.SelectedIndex = int.Parse(dr["MaLop"].ToString()) - 1;
// txtMaSV.Enabled = false;
}
