private void fillFormula(Record r)
 {
     oRng = oSheet.get_Range("D" + (r.startIndex + 1), "D" + (r.startIndex + r.step));
     oRng.Formula = "=$D$" + r.startIndex + " & \".\" & C" + (r.startIndex + 1);
 }
 private void applyIndent(Record r)
 {
     if(r.depth == 0)
     {
         oSheet.get_Range("B" + (r.startIndex + 1), "B" + (r.startIndex + r.step)).IndentLevel = 2;
     }            
 }