Is foreach purely “syntactic sugar”?

Question

The compiler compiles a foreach loop into something like a for loop when the foreach is used with an array. And the compiler compile

Answer 1

It is not just syntactic sugar as the items in a foreach loop are immutable (unchangeable). The reason for this, as Daniel so kindly pointed out, is that most collections will use an enumerator in a foreach, and it is the enumerator that has the restriction of not letting you update the contents of the list while it is being enumerated.

i.e.

Foreach(String s in List)
{
   s = "f";  //this will throw an error.
}