1 using System;
 2 using System.Collections;
 3 using System.Collections.Generic;
 4 using System.ComponentModel;
 5 using System.Data;
 6 using System.Drawing;
 7 using System.Linq;
 8 using System.Text;
 9 using System.Threading.Tasks;
10 using System.Windows.Forms;
11 //using Microsoft.Win32;
12 
13
 
 
14 namespace WindowsFormsApplication16
15 {
16     public partial class Form1 : Form
17     {
18         public Form1()
19         {
20             InitializeComponent();
21         }
22 
23         private void comboBox1_MouseMove(object sender, MouseEventArgs e)
24         {
25             this.comboBox1.DroppedDown =true
 
 ;         
26         }
27 
28         private void button1_Click(object sender, EventArgs e)
29         {
30             string a = "simpl_chinese";
31             string b = "English";
32 
33             if (this.comboBox1.SelectedItem.ToString() == "English")
34             {
35                 Environment.SetEnvironmentVariable("
 
UGII_LANG", "English",
36                                     System.EnvironmentVariableTarget.Machine);   
37             }
38             else if (this.comboBox1.SelectedItem.ToString() == "簡體中文")
39             {
40                 Environment.SetEnvironmentVariable("UGII_LANG", "simpl_chinese",
41                                    System.EnvironmentVariableTarget.Machine); 
42             }
43         }
44     }
45 }

UG環境變量設置