private void button2_Click(object sender, EventArgs e)
        {
            FrmStrengthCalculation3 frm = new FrmStrengthCalculation3();

            frm.Show();
        }
 private void button2_Click(object sender, EventArgs e)
 {
     FrmStrengthCalculation3 frm = new FrmStrengthCalculation3();
     frm.Show();
 }