temperature translate tool

 1 using System;
 2 using System.Collections.Generic;
 3 using System.ComponentModel;
 4 using System.Data;
 5 using System.Drawing;
 6 using System.Linq;
 7 using System.Text;
 8 using System.Windows.Forms;
 9 
10 namespace WindowsFormsApplication3
11 {
12     public partial class Form1 : Form
13     {
14         public Form1()
15         {
16             InitializeComponent();
17         }
18 
19         private void button1_Click(object sender, EventArgs e)
20         {
21             float x;
22             double y;
23             try
24             {
25                 x = Single.Parse(textBox1.Text);
26                 y = getValue(x);
27                 label2.Text = "" + y;
28             }
29             catch (MyException ee)
30             {
31                 label2.Text = ee.Message;
32             }
33             catch (FormatException ee)
34             {
35                 label2.Text = ee.Message;
36             }
37         }
38         private double getValue(float x)
39         {
40             double y;
41             if (x < -273.15f) throw new MyException();
42             y = x * 1.8f + 32;
43             return y;
44         }
45 
46         class MyException : ApplicationException
47         {
48             public MyException()
49                 : base("out of temperature range")
50             { }
51         }
52         private void textBox1_TextChanged(object sender, EventArgs e)
53         {
54 
55         }  
56     }
57 }
58 
59 /*
60 *temperature translate tool 
61 *by 2018/09/18
62 *hekies
63 */