我在datagridview中选择了一列作为数组，如何显示所选的数组值？

// 获取选中列的数据
List<string> selectedColumnData = new List<string>();
foreach (DataGridViewCell cell in dataGridView.SelectedCells)
{
    int columnIndex = cell.ColumnIndex;
    DataGridViewColumn column = dataGridView.Columns[columnIndex];
    foreach (DataGridViewRow row in dataGridView.Rows)
    {
        string cellValue = row.Cells[columnIndex].Value.ToString();
        selectedColumnData.Add(cellValue);
    }
}

// 显示数组值
string selectedColumnDataString = string.Join(", ", selectedColumnData);
textBox.Text = selectedColumnDataString;