Trying to Loop Datagridview in C#

Question

please someone should loop this code for me in c#.

 

double chick2 = (Convert.ToDouble(f2.dataGridView1[1, 0].Value)) * (Convert.ToDouble(f2.dataGridView1[3, 0].Value));

dataGridView1[4, 0].Value = chick2;

dataGridView1[5, 0].Value = chick2;

dataGridView1[6, 0].Value = chick2;

dataGridView1[7, 0].Value = chick2;

dataGridView1[8, 0].Value = chick2;

 

they all have the same value and I don't know how to loop it.

 

kinda new