title: Get all selected items from asp.net ListBox
body: <p>Anyone know of a smooth way to get all of the <strong>selected</strong> items in a listbox control by using extension methods? </p>
  
  <p>And, please, spare me the argument of <em>it's irrelevant as to how one gets such a list because in the end everything uses a loop to iterate over the items and find the selected ones anyway</em>.</p>