AllocConsole, FreeConsole, AttachConsole

 [DllImport("kernel32.dll", SetLastError = true)]
        static extern bool AllocConsole();
        [DllImport("kernel32.dll", SetLastError = true)]
        static extern bool FreeConsole();
        [DllImport("kernel32", SetLastError = true)]
        static extern bool AttachConsole(int dwProcessId);
        [DllImport("user32.dll")]

 AllocConsole();
  FreeConsole();
blabla