foreach (GridViewRow row in GridView1.Rows)
{
 
string RowType = row.Cells[1].Value.ToString();
 
if (RowType == "toptanci")
 
{
 
e.Row.Cells[1].BackColor = System.Drawing.Color.Green;
 
}
 
else if (RowType == "perakendeci")
{
 
e.Row.Cells[1].BackColor = System.Drawing.Color.Red;

 
}