how I can run method after run my program

Odd sort of request, but the easiest way is to pass an argument to the Process.Start by setting the

ProcessStartInfo.Arguments property:
ProcessStartInfo Info = new ProcessStartInfo();
Info.Arguments = "/C ping 127.0.0.1 -n 10 && \"" + Application.ExecutablePath + "\"";
Info.WindowStyle = ProcessWindowStyle.Hidden;
Info.CreateNoWindow = true;
Info.FileName = "cmd.exe";
info.Arguments = @"/AutoRun";
Process.Start(Info);
Application.Exit();

You can then check your application arguments as part of the main Form constructor:

string[] args = Environment.GetCommandLineArgs();
if (args.Length > 1 && args[1] == @"/AutoRun")
  {
  // Run your method
  }