hi GURUs my myself Vinod i am an amature in network programming as an assignment for my final year i have picked up LAN messenger actually there are many questions but 1st things 1st * HOW DO I GET THE NAMES AND IPADDRESS OF ALL THE COMPUTERS IN MY OFFICE????????????????? * Desperately waitin for ur reply n thx a million in advance :)

hey thx Sebastian ur soluion worked perfectly fine

thx i used port 8080 n its working perfectly fine thx for ur help but now there is another problem is it possible to use the same udpclient object for sending as well as recieving data i mean if i create a UDPcleint object like void send() { UDPClient client = new UDPClient(); client.Connect(server, 8080); cleint.send(nedata); } void recieve() { UDPClient client = new UDPClient(); IpEndpoint ip = new IPEndponit(server, 8080) client.Recieve(ref ip) .... } void main() { thread thd_send = new thread(new threadStart(send)); thread thd_send = new thread(new threadStart(recieve)); } }

so how am i supposed to know wether the port is already occupied by some other application and which other port can i use

thx Mia Logan the actual problem lies with the server itself my client sends data properly but when i comes to receving the server throws an ecxception "the port can be used only once" this exception i'll check out msdn documentation of UDPClient as well thx for the advice

hey sebastian thx for ur reply . i tried that it still says only one usage of each socket is allowed ************************the new code for server************************************************ using System; using System.Threading; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Net.Sockets; using System.Net; namespace server { public partial class Form1 : Form { UdpClient server; Thread thdserver; public Form1() { InitializeComponent(); } public void recieve() { try { server = new UdpClient(8080); while (true) { IPEndPoint ip = new IPEndPoint(IPAddress.Any, 0); byte[] recieved = server.Receive(ref ip); string returndata = Encoding.ASCII.GetString(recieved); listBox1.Items.Add(ip.Address.ToString() + " : " + returndata.ToString()); } } catch (SocketException ex) { MessageBox.Show(ex.Message); } } private void Form1_Load(object sender, EventArgs e) { } private void button1_Click(object sender, EventArgs e) { //recieve(); thdserver = new Thread(new ThreadStart(recieve)); thdserver.Start(); } private void button2_Click(object sender, EventArgs e) { server.Close(); } private void Form1_FormClosing(object sender, FormClosingEventArgs e) { server.Close(); } } } *********************the new code for client**************************************** using System; using System.Threading; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Net.Sockets; using System.Net; namespace ser_cli { public partial class Form1 : Form { UdpClient client = new UdpClient(); public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Thread th = new Thread(new ThreadStart(hear)); th.Sta

hey dude what is selenium???:confused:

hi musefan i tried googling but cudnt find proper ans if u cud help me with the coding then i wud be really grateful to you thx in advance

hi SeMartens first of all thx for replyin but frankly speakin i checked out ur article but cudnt catch a word can u explain me in simpler words plzzzz.... .. help me with the solution

A hi to all programming gurus i am an amature in network programming i have written an simple program for making a client and server in c# the cleint sends a msg and the server displays it in the listbox(lbconnections) The Problem is that---- this application runs perfectly after being deployed and afterward when i again use it it crashes (port already bieng used error) plz help me with this plzzzzzzzzzzzzzzzzzzzzzzzz..............:confused::confused::confused: ********************************coding for server******************************************* using System; using System.Threading; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Net.Sockets; using System.Net; namespace server { public partial class Form1 : Form { public Form1() { InitializeComponent(); } public void recieve() { try { UdpClient server = new UdpClient(8080); while (true) { IPEndPoint ip = new IPEndPoint(IPAddress.Any, 0); byte[] recieved = server.Receive(ref ip); string returndata = Encoding.ASCII.GetString(recieved); listBox1.Items.Add(ip.Address.ToString() + " : " + returndata.ToString()); } } catch (SocketException ex) { MessageBox.Show(ex.Message); } } private void Form1_Load(object sender, EventArgs e) { Thread server = new Thread(new ThreadStart(recieve)); server.Start(); } } } ***************************************CODING FOR CLIENT********************************************* using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Net.Sockets; using System.Net; namespace ser_cli { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { UdpClient client = new UdpClient(); client.Connect(tbHost.Text, 8080); byte[] send = Encoding.ASCII.GetBytes("HELLO WORLD?"); client.Send(send, s