change back color if gridView cells has empty.

Question

how to change specific cells backcolor if cells has no data in gridview in asp.net

 

my code is here.. 

for (int i = 0; i < GridView1.Row.Cells.Count; i++)
 {

            if (GridView1.Row[i].Cells[2].Text == "")
            {
                GridView1.Row[i].Cells[2].BackColor = Color.Red;
            }
           else
           {
                GridView1.Row[i].Cells[2].BackColor = Color.Green;
           }
}