IEnumerator: Why is 'foreach' Reset memberfunction not executed?

Hello,

I'm trying to understand the 'foreach' statement and the IEnumerator interfacing.

I run code like:

foreach(MyCitizenType x in MyCity){}

In the associated IEnumerator class, inside the 'Reset', 'MoveNext' and 'Current' memberfunctions I put some Console.WriteLine output. During debugging then at the first time that 'MyCity' is accessed, the IEnumerable GetEnumerator function is called. That seems okay to me ;-)

Then with each run through 'foreach' the 'MoveNext' memberfunction is executed followed by the 'Current' function until 'MoveNext' returns false then the 'Current' function is not executed and the foreach loop exits. So far so good...

But never do I see the 'Reset' function being executed. I was thinking that prior to any 'foreach' execution the 'Reset' function should be called by the operating system.

Also when executing two consequtive 'foreach' statements no 'Reset' function is executed.

Where do I go wrong in my way of thinking

regards,

Henk