How to get summery value

// Get the value of the current cell in the CategoryName column in the master report.
   int balance =Convert.ToInt32(GetCurrentColumnValue(Sum["stock"]));

private void GroupHeader1_BeforePrint(object sender, System.Drawing.Printing.PrintEventArgs e)
       {
           try
           {
               int balance = Convert.ToInt32(xrTableCell10.Text);
               int min = Convert.ToInt32(xrTableCell8.Text);

               if (balance <= min)
               {
                   e.Cancel = true;
               }
               else if (balance > min)
               {
                   e.Cancel = false;
               }
           }
           catch(Exception ex) { Msg.Show("", ex.ToString(), 0); }



       }