Why is AddRange faster than using a foreach loop?

Question

var fillData = new List();
for (var i = 0; i < 100000; i++)
     fillData.Add(i);

var stopwatch1 = new Stopwatch();
stopwatch1.Start();

var autoFill          


        

Answer 1

This is like asking the waiter to bring you one beer ten times and asking him to bring you 10 beers at once.

What do you think is faster :)