I am creating the ip chat program but its getting error ?

Question

Dear Friends,

 

I am creating/ Learning  the Ip Chat Program  in c#, but its getting error.

 

Send you the screen shots for your reference.

my whole network is in DHCP integrated.

 

Can any one helps for getting/ resolve  this error.

 

Here is the Code:

 

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Net;

using System.Net.Sockets;

namespace ChatApp

{

public partial class Form1 : Form

{

Socket sck;

EndPoint epLocal, epRemote;

byte[] buffer;

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

// set up socket

sck = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

sck.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);

//get user IP

textLocalIp.Text = GetLocalIP();

textRemoteIp.Text = GetLocalIP();

}

private string GetLocalIP()

{

IPHostEntry host;

host = Dns.GetHostEntry(Dns.GetHostName());

foreach (IPAddress ip in host.AddressList)

{

if (ip.AddressFamily == AddressFamily.InterNetwork)

return ip.ToString();

}

return "127.0.0.1";

}

private void buttonConnect_Click(object sender, EventArgs e)

{

// Binding Socket

epLocal = new IPEndPoint(IPAddress.Parse(textLocalIp.Text), Convert.ToInt32(textLocalIp.Text));

sck.Bind(epLocal);

// Connecting to Remote Ip

epRemote = new IPEndPoint(IPAddress.Parse(textRemoteIp.Text), Convert.ToInt32(textRemotePort.Text));

sck.Connect(epRemote);

// Listning the specific port

buffer = new byte[1500];

sck.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref epRemote, new AsyncCallback(MessageCallBack), buffer);

}

private void MessageCallBack(IAsyncResult aResult)

{

try

{

byte[] receivedData = new byte[1500];

receivedData = (byte[])aResult.AsyncState;

// Converting bytes to string

ASCIIEncoding aEncoding = new ASCIIEncoding();

string receivedMessage = aEncoding.GetString(receivedData);

//Adding this lessage into list box

listMessage.Items.Add("Friend:" + receivedMessage);

buffer = new byte[1500];

sck.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref epRemote, new AsyncCallback(MessageCallBack), buffer);

}

catch (Exception ex)

{

MessageBox.Show(ex.ToString());

}

}

private void buttonSend_Click(object sender, EventArgs e)

{

//convert string message to byte[]

ASCIIEncoding aEncoding = new ASCIIEncoding();

byte[] sendingMessage = new byte[1500];

sendingMessage = aEncoding.GetBytes(textMessge.Text);

//sending the encoded messsage

sck.Send(sendingMessage);

//Adding to the list box

listMessage.Items.Add("Me:" + textMessge.Text);

textMessge.Text = "";

}

}

}