How to multithread my port scanning app?

This is a discussion on How to multithread my port scanning app? within the C# Programming forums, part of the General Programming Boards category; I'm creating a small port scanning app which use a port range defined by user. My problem with the code ...

  1. #1
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    Jan 2012
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    Smile How to multithread my port scanning app?

    I'm creating a small port scanning app which use a port range defined by user.

    My problem with the code is that I find it not efficient enough meaning that it ping very slow, especially when ports are not responding meaning that I must wait for the timeout before continuing to next port.

    I want to make this small app threaded. The problem here is that I'm kind of blank of how to implement threading in my program.

    This is my code which is a method which does the actual checking, the other part of the code is a simple button with for loop for advancing my port number.
    Code:
                    private void ScanPort(IPAddress address, int port)
            {
                using (TcpClient client = new TcpClient())
                {
                    IAsyncResult result = client.BeginConnect(address, port, null, null);
    
                    if (result.AsyncWaitHandle.WaitOne((int)nudTimeout.Value, false)) txtDisplay.AppendText("Port: " + port + " is open." + Environment.NewLine);
                    else txtDisplay.AppendText("Port: " + port + " is closed." + Environment.NewLine);
                }
            }
    I have read some basic threading tutorial but I just don't know how to implement this piece of code so I can check ports much faster.

    Hope for some advices.

    Regards.

  2. #2
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    You don't need to manually create threads with Async sockets.

  3. #3
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    Quote Originally Posted by theoobe View Post
    You don't need to manually create threads with Async sockets.
    Well, I'm kind of stuck at this part. I have tried to use asynchronous tcp socket connection but I couldn't figure out how to work it out of articles like this or this and my code doesn't do what I would like it to do, to check ports at least much faster speed without wait for single thread to reach the timeout.

  4. #4
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    Replace your for loop with Parallel.For

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