byte + byte = int… why?

Question

Looking at this C# code:

byte x = 1;
byte y = 2;
byte z = x + y; // ERROR: Cannot implicitly convert type \'int\' to \'byte\'

The result of

Answer 1

I think it's a design decission about which operation was more common... If byte+byte = byte maybe much more people will be bothered by having to cast to int when an int is required as result.