DataGridView中CheckBox实现某一列单选

代码如下:
private void dgvChannel_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.ColumnIndex == -1 || e.RowIndex == -1) return;
            int x = dgvChannel.CurrentCell.ColumnIndex;//获取鼠标的点击列
            if (x == 0)//点击第一列是单选。
            {
                for (int i = 0; i < dgvChannel.Rows.Count; i++)
                {
                    DataGridViewCheckBoxCell checkcell = (DataGridViewCheckBoxCell)dgvChannel.Rows[i].Cells[0];
                    checkcell.Value = false;
                }
                DataGridViewCheckBoxCell ifcheck = (DataGridViewCheckBoxCell)dgvChannel.Rows[e.RowIndex].Cells[0];
                ifcheck.Value = true;
            }
        }