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    <p>Well, the problem is the <code>while</code> loop in client method <code>Connect</code>. Remove it because it loops infinitely raising CPU usage to 100% and it's useless.</p> <p>BTW, you have another problems in your code:</p> <ul> <li><strong>CrossThread operation exception</strong></li> </ul> <p>For example in your <code>Client.Recieve</code> method you do:<br> <code>label1.Text = Encoding.ASCII.GetString(g_bmsg, 0, g_bmsg.Length);</code><br> Actually, you're trying to set the label text from another thread (the one listening for received msgs) and this is not allowed;<br> Do something like this:</p> <p>Create a Setter method for the label text:</p> <pre><code>private void SetLabelText(string txt) { if (label1.InvokeRequired) label1.Invoke(new MethodInvoker(delegate { SetLabelText1(txt); })); else label1.Text = txt; } </code></pre> <p>then use the setter instead of directly call <code>label1.Text = ...</code>:</p> <pre><code>SetLabelText(Encoding.ASCII.GetString(g_bmsg, 0, g_bmsg.Length)); </code></pre> <hr> <p><strong>EDIT to answer to OP comment:</strong></p> <p>For a good and extensive explanation of what is a thread, look at its <a href="http://en.wikipedia.org/wiki/Thread_%28computer_science%29" rel="nofollow">wikipedia page</a>.</p> <p>Anyway, in simple words, a running process contains one or more threads and these are part of code that can be executed concurrently.</p> <p>Starting from your TCP example, using <code>Socket.Receive</code> instead of <code>Socket.BeginReceive</code> you would have blocked the execution on <code>Socket.Receive()</code> call (I mean the lines of code after the one containing <code>Receive</code> method wouldn't be reached) until something is received.</p> <p>This because <code>Socket.Receive</code> method runs on the same thread of the following code, and on each thread, the code is executed sequentially (i.e. line by line).</p> <p>Conversely, using <code>Socket.BeginReceive</code>, behind the scene a new thread is created. This thread likely calls and stops on <code>Socket.Receive</code> method, and once received something it calls the method passed as parameter.</p> <p>This makes <code>Socket.BeginReceive</code> asynchronous, while <code>Socket.Receive</code> is synchronous, and this is why I knew ther was another thread (when you hear asynchronous word, is extremely probable that you are dealing with multi-threading)</p> <p>Thus, when you change <code>label.Text</code> you are actually setting it from another thread: the one created by <code>Socket.BeginReceive</code>.</p>
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    1. COThe reason why i made the mistake is because i have not learnt threading haha. Can explain to what are threads and how u know that is a different thread?
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    2. COCheck my edit ;)
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