Preventing stubbed methods from being released

Nice tip! I'm also a proponent of using your friend the preprocessor to stop you from making big mistakes, along with your best friend, the compiler.

You can combine both using this alternative code:

private bool ValidateUserDetails(string userName, string password)
{
  //TODO: Default value used for stub - implement this later
  #warning Not Implemented
  return true;
}

with the option "treat warnings as errors" in Release mode.

That has the big advantage of still showing something in the build results when building in Debug, thus inciting your team to go fix the issue before the time comes to make Release builds.