title: C# TcpClient not sending or reading 100% of data?
body: <p>Hey all. I'm writing a simple client/server application (just for the experience, networking is fairly new to me) where the client sends the server data and the server outputs it to a textbox. It all works fine, except for one small detail... It seems sometimes a connection is made, but the data isn't being sent or read (can't work out which) and thus nothing is being outputted in the textbox. Every time a connection is made a counter is incremented, same thing when a data block is received. When you compare the two, the number of connections is correct but the data counter is usually lower, sometimes by as much as half. Anyway, if anyone can give me some advice or point me in the right direction, it would be greatly appreciated! </p>
  
  <p>Here's the code if you require it: </p>
  
  <p>(SERVER_CODE)</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.ComponentModel;
  using System.Data;
  using System.Drawing;
  using System.Text;
  using System.Windows.Forms;
  using System.Net;
  using System.Net.Sockets;
  using System.Threading;
  
  namespace Server
  {
      public partial class Form1 : Form
      {
          public int Connections = 0;
          public int blocks = 0;
          public int threads = 0;
          public Thread MasterThread;
          public TcpListener Master;
          public volatile bool Run;
  
          public Form1()
          {
              InitializeComponent();
          }
  
          private void Form1_Load(object sender, EventArgs e)
          {
  
          }
  
          public void StartMaster()
          {
              Master = new TcpListener(IPAddress.Any, 1986);
              Master.Start();
              MasterThread = new Thread(new ThreadStart(RunMaster));
              MasterThread.Start();
          }
  
          public void RunMaster()
          {
              threads++;
              label6.Text = String.Format("{0}", threads);
  
              while (Run)
              {
                  TcpClient client = Master.AcceptTcpClient();
                  Connections++;
                  label4.Text = String.Format("{0}", Connections);
                  Thread ClientThread = new Thread(new ParameterizedThreadStart(RunClient));
                  ClientThread.Start(client);
              }
  
              Master.Stop();
  
              threads--;
              label6.Text = String.Format("{0}", threads);
          }
  
          public void RunClient(object tcpClient)
          {
              TcpClient client = (TcpClient)tcpClient;
              byte[] buffer = new byte[4096];
              int byteCount = 0;
              NetworkStream stream = client.GetStream();
              threads++;
              label6.Text = String.Format("{0}", threads);
  
              while (Run)
              {
                  try
                  {
                      byteCount = stream.Read(buffer, 0, 4096);
                  }
                  catch
                  {
                      //Connections--;
                      break;
                  }
  
                  if (byteCount == 0)
                  {
                      //Connections--;
                      break;
                  }
  
                  blocks++;
                  label5.Text = String.Format("{0}", blocks);
  
                  textBox1.AppendText(Encoding.ASCII.GetString(buffer, 0, byteCount) + "\r\n");
              }
  
              client.Close();
  
              threads--;
              label6.Text = String.Format("{0}", threads);
          }
  
          private void button1_Click(object sender, EventArgs e)
          {
              Run = true;
              StartMaster();
          }
  
          private void button2_Click(object sender, EventArgs e)
          {
              Run = false;
          }
      }
  }
  </code></pre>
  
  <p>(CLIENT_CODE)</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.ComponentModel;
  using System.Data;
  using System.Drawing;
  using System.Text;
  using System.Windows.Forms;
  using System.Net;
  using System.Net.Sockets;
  using System.Threading;
  
  namespace Client
  {
      public partial class Form1 : Form
      {
          public Form1()
          {
              InitializeComponent();
          }
  
          private void button1_Click(object sender, EventArgs e)
          {
              IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 1986);
              TcpClient client = new TcpClient();
              try
              {
                  client.Connect(endPoint);
              }
              catch
              {
                  MessageBox.Show("Connect Error");
              }
  
              NetworkStream stream = client.GetStream();
              byte[] data = Encoding.ASCII.GetBytes(textBox1.Text);
              stream.Write(data, 0, data.Length);
              stream.Flush();
              client.Close();
          }
      }
  }
  </code></pre>
  
  <p>Thank-you,<br>
  Tristan!.</p>