Hi

I'm using XamWebGrid to display some data in a Silverlight application. One of the data is displayed in a grid as a date field. When a value changes I update the view model in a collection and reassign the collection to the grid like this:

GridItems = new ObservableCollection<DataItem>(_items);

GridItems is a property binded to grid's ItemsSource. The problem is that grid does not update, but when I do this, it works:

GridItems = null;
GridItems = new ObservableCollection<DataItem>(_items);

Why is that?

Another thing I also noticed. DataItem is defined as below. Notice the private setter!

public class dataItem
{
    public DateTime ValidFrom { get; private set; }
}

With a private setter, although grid refreshes, date values don't and they become null or something. Grid just displays "dd.mm.yyyy" with a gray text. if I use public setter instead, refreshing works.

Here is a grid definition:

<XamWebGrid
    Grid.Row="1"
    AutoGenerateColumns="false"
    ItemsSource="{Binding GridItems, Mode=OneWay}"
    behaviors:DataGridSelectedRowBehavior.SelectedItem="{Binding SelectedItem, Mode=TwoWay}">
    <XamWebGrid.Columns>
        <DateColumn Key="ValidFrom">
            <DateColumn.HeaderTemplate>
                <DataTemplate>
                    <TextBlock Text="Valid from" />
                </DataTemplate>
            </DateColumn.HeaderTemplate>
        </DateColumn>
    </XamWebGrid.Columns>
</XamWebGrid>

Again, why is that? Both behaviours are very strange to me and I don't understand why.

regards

Tomaz