how to multiply two columns and get result in next culomn?

Question

hi,

i m trying this code but it show anything in result column kindly guide..

 

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)

{

for (int n = 0; n < (dataGridView1.Rows.Count - 1); n++)

{

int s = Convert.ToInt32(dataGridView1.Rows[n].Cells[3].Value);

int s1 = Convert.ToInt32(dataGridView1.Rows[n].Cells[4].Value);

int s13 = s1 + s;

dataGridView1.Rows[n].Cells[5].Value = s13;

}