If you don't define a default or parameter-less Constructor for your class the C# compiler creates one for it. You're not going to see it, but it will be in the IL or Intermediate Language code that will be result of the compilation.
I saw this sentence in a programming teaching video, I'm wondering why there is no definite article before result, I've Googled around for use cases of zero article but find nothing related to this situation.
The video is here