public void Load_Du_Lieu() { dtgridview_nguoidung.DataSource = nd.Load_Du_Lieu_Len_Girdview(); cbo_loainguoidung.DataSource = nd.Load_Du_Lieu_Len_CBO(); cbo_loainguoidung.ValueMember = "LOAINGUOIDUNG"; cbo_loainguoidung.DisplayMember = "LOAINGUOIDUNG"; txt_matkhau.Text = dtgridview_nguoidung.CurrentRow.Cells[1].Value.ToString(); }