สอบถามไม่ทราบว่า จะทำอย่างไรครับให้ค่าที่เราแสดงมีทศนิยม 2 ตำแหน่งอะครับ มีภาพประกอบ

        {
            int i;
            double text1 = 0;
            double text2 = 0;
            double text3 = 0;
            double text4 = 0;
            double text5 = 0;
            for (i = 0; i <= dataGridView1.Rows.Count - 1; i++)
            {
                text1 = text1 + Convert.ToDouble(dataGridView1.Rows[i].Cells[7].Value);
                text2 = text2 + Convert.ToDouble(dataGridView1.Rows[i].Cells[8].Value);
                text3 = text3 + Convert.ToDouble(dataGridView1.Rows[i].Cells[9].Value);
                text4 = text4 + Convert.ToDouble(dataGridView1.Rows[i].Cells[10].Value);
                text5 = text5 + Convert.ToDouble(dataGridView1.Rows[i].Cells[11].Value);
            }
            label4.Text = text1.ToString();
            label5.Text = text2.ToString();
            label6.Text = text3.ToString();
            label7.Text = text4.ToString();
            label8.Text = text5.ToString();
        }

FormatNumber(text2,2)

label5.Text = FormatNumber(text2,2)

        private void Calculatetext1()
        {
            int i;
            double text1 = 0;
            double text2 = 0;
            double text3 = 0;
            double text4 = 0;
            double text5 = 0;
            for (i = 0; i <= dataGridView1.Rows.Count - 1; i++)
            {
                text1 = text1 + Convert.ToDouble(dataGridView1.Rows[i].Cells[7].Value);
                text2 = text2 + Convert.ToDouble(dataGridView1.Rows[i].Cells[8].Value);
                text3 = text3 + Convert.ToDouble(dataGridView1.Rows[i].Cells[9].Value);
                text4 = text4 + Convert.ToDouble(dataGridView1.Rows[i].Cells[10].Value);
                text5 = text5 + Convert.ToDouble(dataGridView1.Rows[i].Cells[11].Value);
            }
            label4.Text = text1.ToString();
            label5.Text = FormatNumber(text2,2)
            label6.Text = text3.ToString();
            label7.Text = text4.ToString();
            label8.Text = text5.ToString();
        }

label5.Text =text2.ToString("00.00");