2 questions; why does the first code outputs 15 and also, why does the second code outputs 3 instead of 4?

Question

class Class {
public int x=12;
public int X {
get { return ++x; }
set { x=++value; }
}
}
static void Main() {
Class c = new Class();
c.X = c.X;
Console.Write(c.X);
}

class Temp {
public int dgre=2;
public Temp() {
dgre++;
}
~Temp() {
dgre++;
}
}
static void Main(string[] args) {
Temp t = new Temp();
Console.Write(t.dgre);
}

Answer 1

David (DonDejvo)
So what's the better way I should have written the code?
Let me make some quick improvements in C#