private void btnSearch_Click(object sender, EventArgs e)
{
HangHoaBLL bLL = new HangHoaBLL();
string keyword = txbKeyword.Text;
dtgvDsHangHoa.DataSource = bLL.SearchHangHoaByNameOrID(keyword, txbMaNSX.Text);
foreach (DataGridViewColumn item in dtgvDsHangHoa.Columns)
{
item.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleCenter;
}
}