title: How to get a selection of an observable collection (silverlight) given the first index and index of last element
body: <p>I want to basically get a selection of items from a collection and put it in another collection given the index of the first and last element.
  so say we have an observable collection of 100 object, i only want from 0 to 50 and want to put that in another collection how do i do that?</p>
  
  <p>thanks in advance</p>