--- a/Christie_net.csproj	Tue Apr 13 18:25:15 2021 +0900
+++ b/Christie_net.csproj	Fri Apr 16 01:32:08 2021 +0900
@@ -3,7 +3,7 @@
     <PropertyGroup>
         <OutputType>Exe</OutputType>
         <TargetFramework>netcoreapp3.1</TargetFramework>
-        <StartupObject>Christie_net.Test.Example.FizzBuzz.StartFizzBuzz</StartupObject>
+        <StartupObject>TCPListener</StartupObject>
     </PropertyGroup>
 
     <ItemGroup>

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Test/RewritingTest/TCPClient.cs	Fri Apr 16 01:32:08 2021 +0900
@@ -0,0 +1,31 @@
+using System;
+using System.Net.Sockets;
+using System.Text;
+
+namespace Christie_net {
+public class TCPClient {
+    public static void Main() {
+        TcpClient client = null;
+
+        client = new TcpClient("127.0.0.1", 11000);
+        
+        Console.WriteLine("connect!");
+
+        NetworkStream stream = client.GetStream();
+
+        Byte[] data = Encoding.ASCII.GetBytes("HelloWorld");
+        stream.Write(data, 0, data.Length);
+        Console.WriteLine("Sent");
+
+        data = new Byte[256];
+
+        Int32 bytes = stream.Read(data, 0, data.Length);
+        string receiveData = Encoding.ASCII.GetString(data, 0, bytes);
+        Console.WriteLine("received:" + receiveData);
+
+        stream.Close();
+        client.Close();
+        
+    }
+}
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Test/RewritingTest/TCPListener.cs	Fri Apr 16 01:32:08 2021 +0900
@@ -0,0 +1,58 @@
+using System;
+using System.Net;
+using System.Net.Sockets;
+
+public class TCPListener {
+
+    public static void Main() {
+        TcpListener server = null;
+        try {
+            IPAddress localAddress = IPAddress.Parse("127.0.0.1");
+
+            server = new TcpListener(IPAddress.IPv6Any, 11000);
+            // ipv4/v6対応
+            server.Server.SetSocketOption(SocketOptionLevel.IPv6, SocketOptionName.IPv6Only, 0);
+
+            // 開始
+            server.Start();
+
+            string data = null;
+            Byte[] bytes = new byte[256];
+
+            while (true) {
+                Console.Write("Waiting for a connection... ");
+
+                TcpClient client = server.AcceptTcpClient();
+
+                data = null;
+
+                NetworkStream stream = client.GetStream();
+
+                int i;
+
+                // Loop to receive all the data sent by the client.
+                while ((i = stream.Read(bytes, 0, bytes.Length)) != 0) {
+                    // Translate data bytes to a ASCII string.
+                    data = System.Text.Encoding.ASCII.GetString(bytes, 0, i);
+                    Console.WriteLine("Received: {0}", data);
+
+                    // Process the data sent by the client.
+                    data = data.ToUpper();
+
+                    byte[] msg = System.Text.Encoding.ASCII.GetBytes(data);
+
+                    // Send back a response.
+                    stream.Write(msg, 0, msg.Length);
+                    Console.WriteLine("Sent: {0}", data);
+                }
+
+                // Shutdown and end connection
+                client.Close();
+            }
+        } catch (SocketException e) {
+            Console.WriteLine("SocketException: {0}", e);
+        } finally {
+            server.Stop();
+        }
+    }
+}
\ No newline at end of file