using System;

using System.Diagnostics;

​

class Program

{

    static void Main()

    {

        WindowsCmdCommand.Run("dir", out string output, out string error);

        Console.WriteLine("OUTPUT: " + output);

        Console.WriteLine("ERROR:  " + error);

        Console.ReadLine();

    }

}

​

public static class WindowsCmdCommand

{

    public static void Run(string command, out string output, out string error, string directory = null)

    {

        using Process process = new Process

        {

            StartInfo = new ProcessStartInfo

            {

                FileName = "cmd.exe",

                UseShellExecute = false,

                RedirectStandardOutput = true,

                RedirectStandardError = true,

                RedirectStandardInput = true,

                Arguments = "/c " + command,

                CreateNoWindow = true,

                WorkingDirectory = directory ?? string.Empty,

            }

        };

        process.Start();

        process.WaitForExit();

        output = process.StandardOutput.ReadToEnd();

        error = process.StandardError.ReadToEnd();

    }

}