how I can show the sum of in a datagridview column?

Question

I need to show the sum of the count column from this datagridview, but I don\'t know how I can get to the data in the datagridview.

When I

Answer 1

int sum = 0;
for (int i = 0; i < dataGridView1.Rows.Count; ++i)
{
    sum += Convert.ToInt32(dataGridView1.Rows[i].Cells[1].Value);
}
label1.Text = sum.ToString();