C# UDP server client on same machine

[desire83]

hello, im new in c#.net...
i have made a server application and a client application for the same machine...the server is suppos to send a string to client when the button on the server application is pressed...but im not recieving the string on my client application
here are the codes for both the applications
SERVER:

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;
using System.IO;
 
namespace SOCKETexp2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        //Declaration of network variables/////
 
        Socket sock_server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        static int port_server = 5000;
        static string name_server = "mine";
        static int port_client = 5001;
        IPEndPoint serverEP = new IPEndPoint(Dns.GetHostEntry(name_server).AddressList[0], port_server);
        IPEndPoint clientEP = new IPEndPoint(Dns.GetHostEntry(name_server).AddressList[0], port_client);
 
 
 
        private void button1_Click(object sender, EventArgs e)
        {
            string enter_string = tb_string.Text;
            byte[] send_byte;
            send_byte = System.Text.Encoding.Unicode.GetBytes(enter_string);
            sock_server.Bind(serverEP);
            sock_server.SendTo(send_byte, SocketFlags.None, clientEP);
        }
 

NOW THE CLIENT APPLICATION:

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 socketexp22
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        //Declaration of network variables/////
 
        Socket sock_server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        static int port_server = 5000;
        static string name_server = "mine";
        static int port_client = 5001;
        IPEndPoint serverEP = new IPEndPoint(Dns.GetHostEntry(name_server).AddressList[0], port_server);
        IPEndPoint clientEP = new IPEndPoint(Dns.GetHostEntry(name_server).AddressList[0], port_client);
 
        private void button1_Click(object sender, EventArgs e)
        {
            EndPoint Remote = (EndPoint)serverEP;
            sock_server.Bind(clientEP);
            byte[] byte_recieve=new byte[1024];
            sock_server.ReceiveFrom(byte_recieve, SocketFlags.None, ref Remote);
            string server_text = System.Text.Encoding.Unicode.GetString(byte_recieve);
            tb_string.Text = server_text;
 
        }
    }
}
 

[Plater]

I would try making them not specific to listening to each other.
start by telling them to listen for all udp traffic on the ports you specified.
I would imagine that since both programs are running on the same computer, they will use the localhost ip address, and not the one from the DNS calls, so you are not listening for the correct address.
Listening to all addresses on that port should let you see the message and you can find out who it is coming from

[desire83]

thanks for ur help...but since i said im new in programming...can u guide me how to listen to all ports like u said....and is the local IP add always 127.0.0.1?

[Plater]

Use IPAddress.Any instead of an actual IP address