Reference Item in ListBox

I am trying to delete the item I select in my listBox (named PartsListBox) out of my Access database. How do I reference an item selected in a listBox so the database can go look for that same value? I think my oFile2 variable script is incorrect (var oFile2 = PartsListBox.selectedIndex;)

var oDB = xfa.sourceSet.DataConnection3;
var oFile = Hide1.Subform1.HoldFormID.rawValue;
var oFile2 = PartsListBox.selectedIndex;
var bFound = false;
while(!oDB.isEOF()){  if(xfa.record.DataConnection3.ID.value == oFile && xfa.record.DataConnection3.PartNumbers.value == oFile2){  bFound = true;  break;  }  oDB.next();
}
if(bFound){  oDB.delete();  oDB.update();