Hi Amy,

Similarirly, you could do it in code-behind by placing whenever you decide code similar to the following sample:

         void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            this.TestXamWebGrid.ItemsSource = new ObservableCollection<TestData>()
            {
                new TestData() { DateTimeData = DateTime.MinValue },
                new TestData() { DateTimeData = DateTime.Now },
                new TestData() { DateTimeData = DateTime.Now },
                new TestData() { DateTimeData = DateTime.Now },
                new TestData() { DateTimeData = DateTime.MaxValue }
            };

            MaximumSummaryOperand operand = new MaximumSummaryOperand();

            operand.FormatString = "{0:dd/MM/yyyy}";
            operand.IsApplied = true;

            this.TestXamWebGrid.Columns.DataColumns["DateTimeData"].SummaryColumnSettings.SummaryOperands.Add(operand);
        }

HTH,

Sorry I forgot to explain that there's no column listed in the XAML page.

I set the grid ItemSource to the list collection and control the column display format in ColumnLayoutAssigned event.

Amy