c# 设置全局代理代码和设置进程代理ip

有2个问题

 1. 设置全局代理ip代码

 2 . 怎么设置进程代理ip

C# 设置全局代理代码   参考网址  http://www.wcqblog.com/article/detail/183629208793251840

[DllImport(@"wininet",SetLastError = true,CharSet = CharSet.Auto,EntryPoint = "InternetSetOption",CallingConvention = CallingConvention.StdCall)]
       public static extern bool InternetSetOption
       (
       int hInternet,
       int dmOption,
       IntPtr lpBuffer,
       int dwBufferLength
       );
 
 
       /// <summary>
       /// 设置代理
       /// </summary>
       /// <param name="ip_port">IP地址和端口</param>
       public void SetProxy(string ip_port)
       {
           //打开注册表
           RegistryKey regKey = Registry.CurrentUser;
           string SubKeyPath = @"Software\Microsoft\Windows\CurrentVersion\Internet Settings";
           RegistryKey optionKey = regKey.OpenSubKey(SubKeyPath, true);
           //更改健值，设置代理，
           optionKey.SetValue("ProxyEnable", 1);
           if (ip_port.Length == 0)
           {
               optionKey.SetValue("ProxyEnable", 0);
           }
           optionKey.SetValue("ProxyServer", ip_port);
 
           //激活代理设置
           InternetSetOption(0, 39, IntPtr.Zero, 0);
           InternetSetOption(0, 37, IntPtr.Zero, 0);
       }
 
       /// <summary>
       /// 不使用代理设置
       /// </summary>
       public void UnSetProxy()
       {
           RegistryKey regKey = Registry.CurrentUser;
           string SubKeyPath = @"Software\Microsoft\Windows\CurrentVersion\Internet Settings";
           RegistryKey optionKey = regKey.OpenSubKey(SubKeyPath, true);
           //更改健值，设置代理，
           optionKey.SetValue("ProxyEnable", 0);
           //激活代理设置
           InternetSetOption(0, 39, IntPtr.Zero, 0);
           InternetSetOption(0, 37, IntPtr.Zero, 0);
       }

 2 设置进程代理IP 不清楚。