本文講解了在C#程序中設置代理和取消代理的方法，原理很簡單，就是通過調用C#操作注冊表的相關類來對注冊表的相關內容進行修改而實現的，具體源代碼如下：

1、啟動代理

 private void button3_Click(object sender, EventArgs e)
 {
           //打開注冊表鍵
          Microsoft.Win32.RegistryKey rk = Microsoft.Win32.Registry.CurrentUser.OpenSubKey(@"Software/Microsoft/Windows/CurrentVersion/Internet Settings", true);
           //設置代理可用
          rk.SetValue("ProxyEnable", 1);
          //設置代理IP和端口
          rk.SetValue("ProxyServer", this.textBox1.Text.ToString() + ":" + this.textBox2.Text.ToString());
          rk.Close();
          Factory.ExecuteNonQuery("update IP set area='1' where address= '" + str1 + "'");
          this.dataGridView1.DataSource = Factory.GetDataTable("select * from ip");
          MessageBox.Show("設置成功！！！");
}

2、停止代理

private void button4_Click(object sender, EventArgs e)
{
          //打開注冊表鍵
          Microsoft.Win32.RegistryKey rk = Microsoft.Win32.Registry.CurrentUser.OpenSubKey(@"Software/Microsoft/Windows/CurrentVersion/Internet Settings", true);
          //設置代理不可用
          rk.SetValue("ProxyEnable", 0);
          rk.Close();
          MessageBox.Show("設置成功！！！");
}