there are 2 systems with ips 192.168.1.87(clientA,serverA) and 192.168.1.35(clientB,serverB) . on both the systems client and server runs. now clientA sends a message to serverB on button click. as soon as serverB recieves a message it should send that message to ClientB how is that possible clientA--->serverB(onmessagerecieved)--->cientB server:- int recv; byte[] data = new byte[1024]; IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 10294); Socket newsock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); newsock.Bind(ipep); newsock.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(IPAddress.Any, IPAddress.Parse("127.0.0.1"))); while (true) { IPEndPoint sender2 = new IPEndPoint(IPAddress.Any, 0); IPEndPoint sender1 = new IPEndPoint(IPAddress.Parse("192.168.1.35") , 0); EndPoint tmpRemote = (EndPoint)(sender2); EndPoint tmpRemote1 = (EndPoint)(sender1); data = new byte[1024]; recv = newsock.ReceiveFrom(data, ref tmpRemote); Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv)); string welcome = "7010"; data = Encoding.ASCII.GetBytes(welcome); newsock.SendTo(data, data.Length, SocketFlags.None, tmpRemote1 ); } client:- IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("192.168.1.35"), 10294); byte[] data = new byte[1024]; Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); private void Form1_Load(object sender, EventArgs e) { client.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 10); } private void button1_Click(object sender, EventArgs e) { string welcome = "What's your IP?"; data = Encoding.ASCII.GetBytes(welcome); client.SendTo(data, data.Length, SocketFlags.None, ipep); } private void timer1_Tick(object sender, EventArgs e) { IPEndPoint server = new IPEndPoint(IPAddress.Any, 0); EndPoint tmpRemote = (EndPoint)server; data = new byte[1024]; int recv = client.ReceiveFrom(data, ref tmpRemote); this.richTextBox1.Text = Encoding.ASCII.GetString(data, 0, recv); } private void Form1_FormClosing(object sender, FormClosingEventArgs e) { client.Close(); }

You've shown that you have the code to connect from one machine to another. Just duplicate it. Nothing says that you can have only one socket open at a time so it's fine to do something like this: open Socket A open Socket B . . . read something from A . . . write the data to B . . . close A close B you don't even need to close the sockets for each operation. You can leave them open for the lifetime of the process if you need to instead of opening them and closing them each time that you need them. Unfortunately I don't have any links to tutorials on multiple socket programming; i doubt that any really exist. There's no real difference between using one socket and using multiple sockets except that in the former you see things like Socket and in the latter you'll see things like List ( Socket ). :badger:

i have tried running threads in this format. but this also works only if button is clicked and only for 4 times but i wish 1 client to connect to the server when button is clicked and other client will connect and close for each minute. the code is:- private void button1_Click(object sender, EventArgs e) { for (int i = 0; i < 4; i++) { Thread thread = new Thread(new ParameterizedThreadStart(round)); thread.Start(); thread.Join(); Thread.Sleep(100); } } private void round(object val) { System.Net.IPAddress myIP; System.Net.IPEndPoint myServer; Socket socket; string ip = (string)val; try { myIP = System.Net.IPAddress.Parse(ip); myServer = new System.Net.IPEndPoint(myIP, Int32.Parse("20000")); socket=new Socket(AddressFamily.InterNetwork,SocketType.Stream ,ProtocolType.Tcp); socket.Connect(myServer); NetworkStream netStream=new NetworkStream(socket); Byte\[\] byteMessage=new Byte\[640\]; string sendMessage="hello server"; byteMessage=System.Text.Encoding.Default.GetBytes( sendMessage.ToCharArray()); netStream.Write(byteMessage,0,byteMessage.Length); netStream.Flush(); netStream.Close(); socket.Close(); } catch (Exception ee) { MessageBox.Show(ee.Message); } }

Just because you called tcpListener.AcceptSocket() once doesn't mean that you can't call it again. You can have as many sockets connected to your server at the same time as you want. All you need is some better plumbing in your server to do multiple things at once: listen for clients that are trying to connect, listen to clients that have already connected for data and send received data to other connected clients. You can do this with some proper multi-threading and synchronous methods like you're doing now, but if you have the time and the drive to learn something new then using asynchronous methods would probably provide a cleaner, more elegant solution. MSDN has a decent example of how to listen for new clients asynchronously here: TcpListener.BeginAcceptSocket[^] and TcpListnener.BeginAcceptTcpClient[^] To continue with the async theme, the TcpClient class also has async methods to handle sending and receiving data. Examples of those are on MSDN as well. Of course, this may be overkill depending on what you need . . . :badger:

Don't double post, this service is free so don't get impatient after waiting 13 minutes. No matter how urgent a problem is to you, it is no where near urgent to anyone who is willing to answer your questions. I tell you this because it sometimes puts people off from answering your questions.. Check out the CodeProject forum Guidelines[^] The original soapbox 1.0 is back![^]

Ajithevn wrote: or execute this key? How do you know about it ? Because you can't execute a registry key. You obviously have just enough knowledge to be dangerous. Christian Graus Driven to the arms of OSX by Vista. Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

You could set registry entries to remove the application on a windows startup. you would run your app. set the registry entries (runonce) on restart the runonce would take effect and remove your app during windows startup.

:laugh: Thought you were talking about app window

Take a look at the registry, under the key HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\ie8 It contains a key called UninstallString, with the value "C:\Windows\ie8\spuninst\spuninst.exe". If you execute that application, it will uninstall IE8. The key also contains the name of the app (e.g., "Windows Internet Explorer 8") and the InstallDate (e.g., 20090806). You'll also find service-packs and the likes if you browse further. Alternatively, you can search the registry for the key "uninst.exe". Not every application will have such an entry. DOS-applications are usually copied, and thus don't register an uninstaller for the app. Also keep in mind that the current user might not have the privileges to uninstall applications. Happy Programming :) I are Troll :)

thanks a lot. it works fine

he uses a treeview on a form the treeview is build at initialize or some where else... this snip is only finding the correct uninstallstring according to the selected node.. take a look an System.Windows.Forms.TreeView and Microsoft.Registry to understand!!

Yeah, that works for SQL Server, but I didn't test it with Access. :sigh:

Is this going to be the same excel file you'll be opening every time? You could put an 'AutoOpen' macro in the excel file (which would run anytime the file is opened, just enable macros when you open it) to do all this preliminary stuff you're doing in C#. It would be much easier in VBA anyway. The Code Demon Rises.

Do you have a programming question ? This doesn't look like one to me. Christian Graus Driven to the arms of OSX by Vista. Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

is it possible to use dataset in place of sql database, but i dont know how to transfer data from one machine to another using datasets.can u help me

I think ComponentOne has their own Forum. pleaes Post it here http://helpcentral.componentone.com/CS/forums/[^] Vuyiswa Maseko, Few companies that installed computers to reduce the employment of clerks have realized their expectations.... They now need more and more expensive clerks even though they call them "Developers" or "Programmers." C#/VB.NET/ASP.NET/SQL7/2000/2005/2008 http://www.vuyiswamaseko.somee.com vuyiswa@its.co.za http://www.itsabacus.co.za/itsabacus/

I presume you mean for the web? If so i'd guess the VisibleMonthChanged event... or do you want to determine whether it is the next month or the previous?