Code to select the whole checkbox in datagridview when the header checkbox is selected in winforms?

private void checkboxHeader_CheckedChanged(object sender, EventArgs e)
        {
            for (int i = 0; i < dataGridView1.RowCount; i++)
            {
                dataGridView1[0, i].Value = ((CheckBox)dataGridView1.Controls.Find("checkboxHeader", true)[0]).Checked;

            }
            for (int j = 0; j <= dataGridView1.RowCount - 1; j++)
            {
                dataGridView1[j, 0].Value = ((CheckBox)sender).Checked;
            }
            dataGridView1.EndEdit();
            
          
        }