title: converting fahrenheit to celsius
body: <p>i am trying to convert Fahrenheit to Celsius. when i convert from Celsius to Fahrenheit i get correct results but when i try to convert from Fahrenheit to Celsius i get wrong answer for instance if i type 98.7 Fahrenheit i get 81 degrees instead of 37.. does anyone know were i have gone wrong with my code</p>
  
  <pre><code>if (RadioFah.Checked) 
  {
    {
      double F = 0;    
  
      F = (double.Parse(textBox1.Text) - 32 * 5/9);
  
      textBox2.Text = F.ToString() + " °C ";
  
      //String s = String.Format( "{0:0,00}", F );
      //F = Convert.ToDouble(textBox1.Text) -32 * (5/9);
      //TxtBoxCelsius.Text = s + " °C ";
    }
  }
  else if (RadioCelsius.Checked)
  {
    //if (double.TryParse(textBox2.Text.Text, out C))
    {
      double C = 0;    
  
      C = (double.Parse(textBox2.Text) * (9.0 / 5.0) + 32);
  
      textBox1.Text = C.ToString("N1") + " °F ";
    }
  }
  </code></pre>