Totals not getting displayed

Hi

  I have below code but totals not getting displayed in Footer

                                    
                                        
                                        

                            

                                

                                    
#
                                    
Student Name
                                    
Delivered
                                    
Returned
                                    
Balance
                                
                            
                            

                                

                                            

                                                
                                            
                                            
                                            

                                                  
                                            

                                                   
                                          
                                            

                                                 
                                            

                                                
                                        
                                    
                                    

                                            

                                            
Total
                                            

                                            

                                            

                                        
                                        
                                    
                                
                            
                        

protected void rptData_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            try
            {
                if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
                {
                    RepeaterItem rptitem = e.Item;

                    int sumOfTwocolumn = Convert.ToInt32(((Label)e.Item.FindControl("lblDelivered")).Text) -
                    Convert.ToInt32(((Label)e.Item.FindControl("lblReturned")).Text);

                    totDelivered += Convert.ToInt32(((Label)e.Item.FindControl("lblDelivered")).Text);
                    totReturned += Convert.ToInt32(((Label)e.Item.FindControl("lblReturned")).Text);

                    ((Label)e.Item.FindControl("lblBalance")).Text = Convert.ToString(sumOfTwocolumn);

                    if (e.Item.ItemType == ListItemType.Footer)
                    {
                        ((Label)e.Item.FindControl("lblDeliveredTotal")).Text = "Total : ";
                        ((Label)e.Item.FindControl("lblReturnedTotal")).Text = totDelivered.ToString();
                        ((Label)e.Item.FindControl("lblBalanceTotal")).Text = totReturned.ToString();
                    }
                }
            }
            catch (Exception ex)
            {
                Utility.SaveErrorLog(ex.Message, System.IO.Path.GetFileName(Request.Path), System.Reflection.MethodBase.GetCurrentMethod().Name, Convert.ToInt32(hdfLoginCode.Value));
                ShowMessage("Oops...", ex.Message, "error");
            }
        }

Thanks