Re: Array vs List<>

> // no way to do this without indexed access
> for (int i=0 ; i<a.Length ; i++)
> {
>        ProcessElements(a[i], b[i]);
> }

Or you could try to create an IEnumerable combiner.
I have googled a bit at first, but I think I'm using the wrong keywords...
So here's some code [1] of what I mean.
Mind you, I misused KeyValuePair, it is not tested and its coded right
here in my gmail!

HTH
// Ryan

[1]
static IEnumerable<KeyValuePair<T,U>> Combine<T,U>(IEnumerable<T> t,
IEnumerable<U> u)
{
  var et = t.GetEnumerator();
  var eu = u.GetEnumerator();
		
  while(true)
  {
    bool tMoved = et.MoveNext();
    bool uMoved = eu.MoveNext();
		
    if ( tMoved || uMoved)
    {
      yield return new KeyValuePair<T,U>(tMoved ? et.Current :
default(T), uMoved ? eu.Current : default(U));
    }
    if ( !tMoved && !uMoved)
    {
      break;
    }
  }
}

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