This tutorial is written in C# because it uses delegates and events. The reason why is so that no single tile needs to know about the other tiles, making this code extremely flexible, you culd even change your scene during runtime. If you don't know about delegates and events I really recommend you to check out prime31studios' video. Their video series really got me into C# development.
To give you the basic idea, events and delegates mean that somewhere somehow something happens and some other objects react to that. The object that triggered the event itself has no idea who (if anyone) is listening and how they will resond. For example you could have an RPG where when you draw your sword it makes villagers run away and guards draw their own weapons. Your hero would not need to know how many villagers and guards (if any) are around, he just needs to fire the event and all listeners will react accordingly.
