C#中DataGridView顯示行號

//插入行和刪除行兩個函數集合起來，顯示行號;        private void dataGridView_EquipSelect_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e)        {            //RowCount是添加的行的個數; RowIndex是添加的第一行的行號;            for (int i = 0; i < e.RowCount; i++)            {                this.dataGridView_EquipSelect.Rows[e.RowIndex + i].HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleRight;                this.dataGridView_EquipSelect.Rows[e.RowIndex + i].HeaderCell.Value = (e.RowIndex + i + 1).ToString();            }            for (int i = e.RowIndex + e.RowCount; i < this.dataGridView_EquipSelect.Rows.Count; i++)            {                this.dataGridView_EquipSelect.Rows[i].HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleRight;                this.dataGridView_EquipSelect.Rows[i].HeaderCell.Value = (i + 1).ToString();            }        }        //插入行和刪除行兩個函數集合起來，顯示行號;        private void dataGridView_EquipSelect_RowsRemoved(object sender, DataGridViewRowsRemovedEventArgs e)        {            for (int i = e.RowIndex + e.RowCount-1; i < this.dataGridView_EquipSelect.Rows.Count; i++)            {                this.dataGridView_EquipSelect.Rows[i].HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleRight;                this.dataGridView_EquipSelect.Rows[i].HeaderCell.Value = (i+1).ToString();            }        }