private void loadList()
{
PaymentServiceClient payService = new PaymentServiceClient();
if (IDnum == "All")
payment = new List<Payment>(payService.GetAllPayments());
else
payment = new List<Payment>(payService.GetAllStudentsPayments(IDnum));
gridView.DataSource = payment;
GroupDescriptor descriptor = new GroupDescriptor();
descriptor.GroupNames.Add("Student", ListSortDirection.Ascending);
this.gridView.GroupDescriptors.Add(descriptor);
GridViewSummaryItem summaryItem = new GridViewSummaryItem("Amount", "Total: {0}", GridAggregateFunction.Sum);
GridViewSummaryRowItem summaryRowItem = new GridViewSummaryRowItem();
summaryRowItem.Add(summaryItem);
this.gridView.SummaryRowsBottom.Add(summaryRowItem);
}
