static void Main(string[] args)
        {

                Process temp = new Process();

                try
                {
                    temp.StartInfo.FileName = @"D:\projects\add\Debug\add.exe";
                    temp.StartInfo.Arguments = "1 2";
                    temp.StartInfo.ErrorDialog = true;
                    temp.Start();

                    temp.WaitForExit();

                    int result = temp.ExitCode;

                    Console.WriteLine("Ket qua la {0}", result);
                }
                catch (Exception)
                {

                    Console.WriteLine("Could not start process");
                }
        }