c#使用dataset对datagridview选中全部复选框

DataSet dataSet = new DataSet();
DataTable dataTable = new DataTable();
dataSet.Tables.Add(dataTable);

dataTable.Columns.Add("ID", typeof(int));
dataTable.Columns.Add("Name", typeof(string));
dataTable.Columns.Add("Selected", typeof(bool));

dataTable.Rows.Add(1, "John", false);
dataTable.Rows.Add(2, "Mary", false);
dataTable.Rows.Add(3, "Tom", false);

dataGridView.DataSource = dataSet.Tables[0];

DataGridViewCheckBoxColumn checkBoxColumn = new DataGridViewCheckBoxColumn();
checkBoxColumn.HeaderText = "Select All";
checkBoxColumn.Name = "selectAllColumn";
dataGridView.Columns.Insert(0, checkBoxColumn);

private void dataGridView_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
    if (e.RowIndex == -1 && e.ColumnIndex == 0)
    {
        bool selectAll = (bool)dataGridView.Rows[0].Cells[0].EditedFormattedValue;
        foreach (DataGridViewRow row in dataGridView.Rows)
        {
            row.Cells[0].Value = selectAll;
        }
    }
}