Introduction
The Client Code
{codecitation class="brush: csharp; gutter: true;" width="500px"}
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.Sockets;
using System.Threading;
using System.Net;
namespace NoticeSystemClient
{
public partial class MainForm : Form
{
public delegate void ShowMessage(string message);
public ShowMessage myDelegate;
Int32 port = 11000;
UdpClient udpClient = new UdpClient(11000);
Thread thread;
public MainForm()
{
//CheckForIllegalCrossThreadCalls = false;
InitializeComponent();
}
private void MainForm_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Escape)
{
thread.Abort();
udpClient.Close();
Close();
}
}
private void ReceiveMessage()
{
while (true)
{
IPEndPoint remoteIPEndPoint = new IPEndPoint(IPAddress.Any, port);
byte[] content = udpClient.Receive(ref remoteIPEndPoint);
if (content.Length > 0)
{
string message = Encoding.ASCII.GetString(content);
this.Invoke(myDelegate, new object[] { message });
}
}
}
private void ShowMessageMethod(string message)
{
richText.Text = message;
}
private void MainForm_Load(object sender, EventArgs e)
{
myDelegate = new ShowMessage(ShowMessageMethod);
thread = new Thread(new ThreadStart(ReceiveMessage));
thread.IsBackground = true;
thread.Start();
}
}
}
{/codecitation}
The Server Side Code: {codecitation class="brush: csharp; gutter: true;" width="500px"}
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.Sockets;
using System.Net;
namespace NoticeSystem
{
public partial class MainForm : Form
{
UdpClient udpClient = new UdpClient();
public MainForm()
{
InitializeComponent();
}
private void btnClose_Click(object sender, EventArgs e)
{
udpClient.Close();
Close();
}
private void btnSend_Click(object sender, EventArgs e)
{
Int32 port = 11000;
IPAddress ip = IPAddress.Parse(txtStartIP.Text.Trim());
IPEndPoint ipEndPoint = new IPEndPoint(ip,port);
byte[] content = Encoding.ASCII.GetBytes(richText.Text);
try
{
int count = udpClient.Send(content, content.Length, ipEndPoint);
if (count > 0)
{
MessageBox.Show("Message has been sent.", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
catch
{
MessageBox.Show("Error occurs.", "Exclamation", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
}
}
}
{/codecitation}
Thank you
Amal
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