c#套接字异常:试图以套接字访问权限禁止的方式访问套接字

这是我使用的代码。这是我从网上得到的代码，他们说运行正常。这个评论也很好，但我不明白为什么它不适合我。还有一件事，我是在用户模式下使用这个应用程序的，而不是在管理员模式下。

private void btnStart_Click(object sender, EventArgs e)
    {
        if (cmbInterfaces.Text == "")
        {
            MessageBox.Show("Select an Interface to capture the packets.", "MJsniffer", 
                MessageBoxButtons.OK, MessageBoxIcon.Error);
            return;
        }
        try
        {
            if (!bContinueCapturing)        
            {
                //Start capturing the packets...
                btnStart.Text = "&Stop";
                bContinueCapturing = true;
                //For sniffing the socket to capture the packets has to be a raw socket, with the
                //address family being of type internetwork, and protocol being IP
                Console.WriteLine("1");
                mainSocket = new Socket(AddressFamily.InterNetwork,
                    SocketType.Raw, ProtocolType.IP);
                Console.WriteLine("2");
                //Bind the socket to the selected IP address
                mainSocket.Bind(new IPEndPoint(IPAddress.Parse(cmbInterfaces.Text), 0));
                Console.WriteLine("3");
                //Set the socket  options
                mainSocket.SetSocketOption(SocketOptionLevel.IP,            //Applies only to IP packets
                                           SocketOptionName.HeaderIncluded, //Set the include the header
                                           true);                           //option to true
                Console.WriteLine("4");
                byte[] byTrue = new byte[4] {1, 0, 0, 0};
                byte[] byOut = new byte[4]{1, 0, 0, 0}; //Capture outgoing packets
                //Socket.IOControl is analogous to the WSAIoctl method of Winsock 2
                mainSocket.IOControl(IOControlCode.ReceiveAll,              //Equivalent to SIO_RCVALL constant
                                                                            //of Winsock 2
                                     byTrue,                                    
                                     byOut);
                //Start receiving the packets asynchronously
                mainSocket.BeginReceive(byteData, 0, byteData.Length, SocketFlags.None,
                    new AsyncCallback(OnReceive), null);
            }
            else
            {
                btnStart.Text = "&Start";
                bContinueCapturing = false;
                //To stop capturing the packets close the socket
                mainSocket.Close ();
            }
        }
        catch (SocketException ex)
        {
            Console.WriteLine("5");
            MessageBox.Show(ex.Message, "MJsniffer", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
        catch (Exception ex)
        {
            Console.WriteLine("6");
            MessageBox.Show(ex.Message, "MJsniffer", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
    }