Add remember me button and more

Socket/EchoServer.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Net;
+using System.Net.Sockets;
+using System.Threading.Tasks;
+
+namespace SocketServer {
+    public class EchoServer {
+        public void Start(int port = 9656) {
+            IPEndPoint endPoint = new IPEndPoint(IPAddress.Loopback, port);
+            Socket socket = new Socket(endPoint.AddressFamily, SocketType.Stream, SecurityProtocolType.Tcp);
+            socket.Bind(endPoint);
+            socket.Listen(128);
+            _ = Task.Run(() => DoEcho(socket));
+        }
+        private async Task DoEcho(Socket socket) {
+            while (true) {
+                Socket clientSocket = await Task.Factory.FromAsync(
+                    new Func<AsyncCallback, object, IAsyncResult>(socket.BeginAccept), 
+                    new Func<IAsyncResult, Socket>(socket.EndAccept), 
+                    null).ConfigureAwait(false);
+                using (NetworkStream nStream = new NetworkStream(clientSocket, true)) {
+                    byte[] buffer = new byte[1024];
+                    while (true) {
+                        int bytesRead = await nStream.ReadAsync(buffer, 0, buffer.Length).ConfigureAwait(false);
+                        if (bytesRead == 0)
+                            break;
+                        await nStream.WriteAsync(buffer, 0, bytesRead).ConfigureAwait(false);
+                    }
+                }
+            }
+        }
+    }
+}