title: How do I update a single item in an ObservableCollection class?
body: <p>How do I update a single item in an ObservableCollection class?</p>
  
  <p>I know how to do an Add.  And I know how to search the ObservableCollection one item at a time in a "for" loop (using Count as a representation of the amout of items) but how do I chage an existing item.  If I do a "foreach" and find which item needs updating, how to I put that back into the ObservableCollection></p>