/// <summary>

 /// 断开网络连接

 /// </summary>

 public static void Logout()

         {

             ReadOnlyCollection<RasConnection> conList = RasConnection.GetActiveConnections();

             foreach (RasConnection con in conList)

             {

                 con.HangUp();

             }

         }

 /// <summary>

 /// 开始拨号

 /// </summary>

 /// <returns>返回拨号进程的返回值</returns>

         public static int Connect()

         {

             //联网参数

             string intername = Common.DESEncrypt.DesDecrypt(Common.MethodClass.GetConfigValue("intername").ToString());

             string interpwd = Common.DESEncrypt.DesDecrypt(Common.MethodClass.GetConfigValue("interpwd").ToString());

             ProcessWindowStyle _windowstyle = ProcessWindowStyle.Hidden;

             Process pro = new Process();

             pro.StartInfo.FileName = "rasdial.exe";

 //intername宽带用户名，interpwd宽度密码

             pro.StartInfo.Arguments = "宽带连接" + " " + intername + " " + interpwd;

             pro.StartInfo.WindowStyle = _windowstyle;

             pro.Start();

             pro.WaitForExit();

             return pro.ExitCode;

         }

  public void buttonItem2_Click(object sender, EventArgs e)

         {

             Logout();

             if (Connect() == )

             {

                 //拨号成功

             }

             else

             {

                 //拨号失败

             }

         }