DataGridViewCell cl;
for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
{
cl = dataGridView1.Rows[i].Cells[0];
if (cl.Value.ToString() == "1")
{
cl.Style.BackColor = Color.Blue;
cl.Style.ForeColor = Color.Blue;
}
if (cl.Value.ToString() == "2")
{
cl.Style.BackColor = Color.Red;
cl.Style.ForeColor = Color.Red;
}
if (cl.Value.ToString() == "3")
{
cl.Style.BackColor = Color.Green;
cl.Style.ForeColor = Color.Green;
}
}