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    <p>The <code>UdpClient</code> is naturally blocking until bytes are received.</p> <p>This means that you shouldn't get data at all, assuming that you're looking for a way to indicate if you have received data, then once you move past the <code>udpc.Recieve</code>, you should return true.</p> <p>I would also consider changing the code a bit as you will have some compilation issues with the <code>= null</code> statement as this does not translate into a compilable code expression.</p> <p>There is also a problem with your if else statement as you're attempting to read from the UDP client which would consume the sent data.</p> <p>Personally I would opt for a UDP socket, but in order to get you rolling I would change the code to something like this:</p> <pre><code>String text = textBox1.Text; UdpClient udpc = new UdpClient(text,8899); IPEndPoint ep = null; while (true) { MessageBox.Show("Name: "); string name = "Connected"; if (name == "") break; //This will never happen because you have already set the value byte[] sdata = Encoding.ASCII.GetBytes(name); int dataSent = 0; try { dataSent = udpc.Send(sdata, sdata.Length); } catch(Exception e) { dataSent = 0; //There is an exception. Probably the host is wrong } if (dataSent &gt; 0) { try { byte[] rdata = udpc.Receive(ref ep); if(rdata!=null &amp;&amp; rdata.Length &gt; 0) { string job = Encoding.ASCII.GetString(rdata); MessageBox.Show(job) //True here as we managed to recieve without going to the catch statement //and we actually have data in the byte[] } else { MessageBox.Show("We did not recieve any data"); //False here, because the array was empty. } } catch(Exception udpe) { //False here as we had a socket exception or timed out MessageBox.Show(udpe.ToString()); } } } </code></pre>
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    1. POHow to convert byte into Boolean
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