how can i limit the number of selected items in a radTreeListView

[Biya]

how can i limit the number of selected (checked) items in a radTreeListView. Say after a user has selected (checked) 5 items, a stop them from checking/selecting more items in c#. 

Which event to i need to handle?

[Maya]

Hello Biya,

You can handle SelectionChanging event and cancel it when required. The number of the selected items can be found through SelectedItems collection of the tree list view. 

Regards,
Maya
Telerik

[Biya]

this is the XML for the RadTreeListView


 

<telerik:RadTreeListView x:Name="radTreeListView" ItemsSource="{Binding Items}"
           AutoGenerateColumns="False" Grid.RowSpan="2" SelectionChanged="radTreeListView_SelectionChanged" SelectionMode="Extended" SelectedItem="{Binding SelectedItem, Mode=TwoWay}" SelectionChanging="radTreeListView_SelectionChanging" BeginningEdit="radTreeListView_BeginningEdit">
               <telerik:RadTreeListView.ChildTableDefinitions>
                   <telerik:TreeListViewTableDefinition ItemsSource="{Binding Items}" />
               </telerik:RadTreeListView.ChildTableDefinitions>
               <telerik:RadTreeListView.Columns>
                   <telerik:GridViewSelectColumn/>
                   <telerik:GridViewDataColumn DataMemberBinding="{Binding Name}"   Header="Name" />
                   </telerik:RadTreeListView.Columns>
           </telerik:RadTreeListView>

And this is the C# code

private void radTreeListView_SelectionChanging(object sender, SelectionChangingEventArgs e)

      {

          if (radTreeListView.SelectedItems.Count() > 2)

          {

              e.Cancel = true;

          }

      }

BUT it stiill doesn't stop a user from selected more than only 2 items. With that code i can still selected any number of items.
Why is e.Cancel = true; not working even when the value of radTreeListView.SelectedItems.Count() is greater than 2