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 WindowsFormsApplication1615 {16     public partial class Form1 : Form17     {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() == "简体中文")39             {40                 Environment.SetEnvironmentVariable("UGII_LANG", "simpl_chinese",41                                    System.EnvironmentVariableTarget.Machine); 42             }43         }44     }45 }