using System;
using System.Text;
using System.IO;
using System.Diagnostics;

class RunResults
{
    public int ExitCode;
    public Exception RunException;
    public StringBuilder Output;
    public StringBuilder Error;
}

class Program
{
    public static RunResults RunExecutable(string executablePath, string arguments, string workingDirectory)
    {
        RunResults runResults = new RunResults
        {
            Output = new StringBuilder(),
            Error = new StringBuilder(),
            RunException = null
        };
        try
        {
            if (File.Exists(executablePath))
            {
                using (Process proc = new Process())
                {
                    proc.StartInfo.FileName = executablePath;
                    proc.StartInfo.Arguments = arguments;
                    proc.StartInfo.WorkingDirectory = workingDirectory;
                    proc.StartInfo.UseShellExecute = false;
                    proc.StartInfo.RedirectStandardOutput = true;
                    proc.StartInfo.RedirectStandardError = true;
                    proc.OutputDataReceived +=
                        (o, e) => runResults.Output.Append(e.Data).Append(Environment.NewLine);
                    proc.ErrorDataReceived +=
                        (o, e) => runResults.Error.Append(e.Data).Append(Environment.NewLine);
                    proc.Start();
                    proc.BeginOutputReadLine();
                    proc.BeginErrorReadLine();
                    proc.WaitForExit();
                    runResults.ExitCode = proc.ExitCode;
                }
            }
            else
            {
                throw new ArgumentException("Invalid executable path.", "exePath");
            }
        }
        catch (Exception e)
        {
            runResults.RunException = e;
        }
        return runResults;
    }

    public static void Main()
    {
        RunResults runResults = RunExecutable("./ConsoleApplication2.exe", "aaa bbb ccc", ".");
        if (runResults.RunException != null)
            Console.WriteLine(runResults.RunException);
        else
        {
            Console.WriteLine("Output");
            Console.WriteLine("======");
            Console.WriteLine(runResults.Output);
            Console.WriteLine("Error");
            Console.WriteLine("=====");
            Console.WriteLine(runResults.Error);
        }
    }
}