Copying One Gridview Cell Value To Another?

i need to copy the one gridview cellvalue to another gridview eg: gridview1:

a b c
1 s 2
2 v 3
3 d 4

The Second Gridview Value Should Be

a g h
1
1
2
2
2
3
3
3

but i am getting the last value 3 in each row. My Coding

ArrayList da1 = new ArrayList();
ArrayList da2 = new ArrayList();
int a1 = 0;
int a2 = 0;
int id=0;
foreach (GridViewRow row2 in grv2.Rows)
{
foreach (GridViewRow row1 in grv1.Rows)
{
a1 = int.Parse(row1.Cells[3].Text);
da1.Add(a1);
da2.Add(a2);
foreach (int ir in da1)
{
if (id < ir)
{
row2.Cells[1].Text = row1.Cells[1].Text;
}
}
}
}