DataGridView控件显示行号

private void dgvKBRollUp_RowsRemoved(object sender, DataGridViewRowsRemovedEventArgs e)
{
if (dgvKBRollUp.Rows.Count != 0)
{
for (int i = 0; i < e.RowCount; i++)
{
this.dgvKBRollUp.Rows[e.RowIndex + i].HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleRight;
this.dgvKBRollUp.Rows[e.RowIndex + i].HeaderCell.Value = (e.RowIndex + i + 1).ToString();
}

for (int i = e.RowIndex + e.RowCount; i < this.dgvKBRollUp.Rows.Count; i++)
{
this.dgvKBRollUp.Rows[i].HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleRight;
this.dgvKBRollUp.Rows[i].HeaderCell.Value = (i + 1).ToString();
}

}