update

MySolution/ConsoleApp/TelnetSamples/AsyncTelnetConsole.cs

@@ -20,23 +20,33 @@ namespace ConsoleApp.TelnetSamples
             try
             {
                 _client.MessageCallback += On_Receive;
+                _client.ErrorCallback += On_ErrorCallback;
                 _client.Connect(ip, port);
 
                 while (true)
                 {
-                    string command = Console.ReadLine();
+                    string command = Console.ReadLine().ToLower();
                     if (command == "quit" || command == "exit")
                         break;
-
-                    _client.SendCommand(command);
+                    else if (command == "disconnect" || command == "disconn")
+                        _client.Close();
+                    else if (command == "connect" || command == "conn")
+                        _client.Connect(ip, port);
+                    else
+                        _client.SendCommand(command);
                 }
             }
-            catch (Exception)
+            catch (Exception ex)
             {
-                throw;
+                Console.WriteLine($"[ERR] {ex.Message}");
             }
         }
 
+        private void On_ErrorCallback(object? sender, Exception e)
+        {
+            Console.WriteLine(e.Message);
+        }
+
         private void On_Receive(object? sender, string e)
         {
             Console.Write(e);