How to iterate through two collections of the same length using a single foreach

Question

I know this question has been asked many times before but I tried out the answers and they don\'t seem to work.

I have two lists of the same length but not the same

Answer 1

Instead of a foreach, why not use a for()? for example...

int length = list1.length;
for(int i = 0; i < length; i++)
{
    // do stuff with list1[i] and list2[i] here.
}