private void dgvDauSach_CellClick(object sender, DataGridViewCellEventArgs e)
{
if ((e.RowIndex >= 0 && e.ColumnIndex >= 0) && kt == 1)
{
txtMaSach.Text = dgvDauSach.CurrentRow.Cells["masach"].Value.ToString();
txtTenSach.Text = dgvDauSach.CurrentRow.Cells["tensach"].Value.ToString();
txtTacGia.Text = dgvDauSach.CurrentRow.Cells["tacgia"].Value.ToString();
txtTheLoai.Text = dgvDauSach.CurrentRow.Cells["theloai"].Value.ToString();
txtViTri.Text = dgvDauSach.CurrentRow.Cells["vitri"].Value.ToString();
txtNhaXB.Text = dgvDauSach.CurrentRow.Cells["nxb"].Value.ToString();
DataTable dt = DauSachBUS.LoadMaHD("select_mahd", txtMaSach.Text);
cboMaHD.DataSource = dt;
cboMaHD.DisplayMember = "mahd";
cboMaHD.ValueMember = "mahd";
string a = cboMaHD.SelectedValue.ToString();
int tong = 0;
for (int i = 0; i < dt.Rows.Count; i++)
{
tong += int.Parse(dt.Rows[i]["soluong"].ToString());
}
txtTongSoLuong.Text = tong.ToString();
txtTongSoLuong.Enabled = true;
lblSoLuong.Enabled = true;
}
}