private void txtGiaTriTimKiem_KeyUp(object sender, KeyEventArgs e)
{
string colName = cmCotTimKiem.Text;
string strFilter = txtGiaTriTimKiem.Text.Trim();
dgvDanhMucNhanVien.DataSource = dbNhanVien.Fillter(colName, strFilter);
foreach (DataGridViewRow row in dgvDanhMucNhanVien.Rows)
{
row.HeaderCell.Value = (row.Index + 1).ToString();
}
dgvDanhMucNhanVien.AutoResizeRowHeadersWidth(DataGridViewRowHeadersWidthSizeMode.AutoSizeToAllHeaders);
}