How to convert a decimal value of four pleces to decimal value of two places in a gridview

private void dgchkout_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
       {
           try
           {
               if (e.ColumnIndex == 12)
               {
                   if (e.Value == null) return; // nothing entered return

                   decimal value = Convert.ToDecimal(e.Value); // get the entered value - may throw an exception

                   e.Value = value.ToString("N2"); // format the entered value

                   e.FormattingApplied = true;
               }
           }
           catch (Exception ex)
           {
               log.Trace("CheckOutDet:dgchkout_CellFormatting" + ex.Message);
               ex.Data.Clear();
           }
       }