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PONullreferenceException is unhandled
 

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    <p>I am not connected to my server and i type some text in the send text and press send, there will be a warning showing in my program <code>serverStream.Write(outStream, 0, outStream.Length);</code> <code>NullreferenceException is unhandled</code>. is there anyway to prevent this warning from showing?</p> <pre><code>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; namespace SocketClient { public partial class SocketClient : Form { System.Net.Sockets.TcpClient clientSocket = new System.Net.Sockets.TcpClient(); NetworkStream serverStream = default(NetworkStream); string readData = null; public SocketClient() { InitializeComponent(); } private void getMessage() { while (true) { serverStream = clientSocket.GetStream(); int buffSize = 0; byte[] inStream = new byte[10025]; buffSize = clientSocket.ReceiveBufferSize; serverStream.Read(inStream, 0, buffSize); string returndata = System.Text.Encoding.ASCII.GetString(inStream); readData = "" + returndata; msg(); } } private void msg() { if (this.InvokeRequired) this.Invoke(new MethodInvoker(msg)); else textDisplay.Text = textDisplay.Text + Environment.NewLine + " &gt;&gt; " + readData; } private void buttonConnect_Click(object sender, EventArgs e) { readData = "Conected to NYP Chat Server ..."; msg(); clientSocket.Connect("127.0.0.1", 8888); serverStream = clientSocket.GetStream(); byte[] outStream = System.Text.Encoding.ASCII.GetBytes(textName.Text + "$"); serverStream.Write(outStream, 0, outStream.Length); serverStream.Flush(); Thread ctThread = new Thread(getMessage); ctThread.Start(); } private void buttonSend_Click(object sender, EventArgs e) { // send text byte[] outStream = System.Text.Encoding.ASCII.GetBytes(textSend.Text + "$"); serverStream.Write(outStream, 0, outStream.Length); serverStream.Flush(); //clear textsend textbox textSend.Text = ""; } private void textDisplay_TextChanged(object sender, EventArgs e) { textDisplay.SelectionStart = textDisplay.Text.Length; textDisplay.ScrollToCaret(); textDisplay.Refresh(); } private void textSend_TextChanged(object sender, EventArgs e) { buttonSend.Enabled = !string.IsNullOrEmpty(textSend.Text); } } } </code></pre>
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    1. COBy the way, there's no point in making a separate `returndata` variable in `getMessage`; you can simply write `readData = Encoding.ASCII.GetString(inStream);`.
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