How to skip a selection for any specific index or based on selected items count in xamarin.forms listview?

 
<ContentPage xmlns:syncfusion="clr-namespace:Syncfusion.ListView.XForms;assembly=Syncfusion.SfListView.XForms" >
    <ContentPage.Content>
        <Grid >
         <syncfusion:SfListView x:Name="listView" ItemsSource="{Binding contactsinfo}" SelectionChanging="listView_SelectionChanging" SelectionMode="Multiple">
            </syncfusion:SfListView>
        </Grid>
    </ContentPage.Content>
</ContentPage>
 

namespace ListViewSample
{
    public partial class ListViewSample : ContentPage
    {
             private void listView_SelectionChanging(object sender, Syncfusion.ListView.XForms.ItemSelectionChangingEventArgs e)
             {
                      var addedItemCount = e.AddedItems.Count;
                      if (addedItemCount == 0)
                           return;
 
                      var items = e.AddedItems;
                      var index = listView.DataSource.DisplayItems.IndexOf(items[0]);
                      if (index == 0)
                          e.Cancel = true;     //Selection cancelled for 1st item
 
                     if (listView.SelectedItems.Count>=3 && addedItemCount != 0)
                     {
                           e.Cancel = true;
                           DisplayAlert("Message", "You can select only 3 items.Can you please deselect any one item", "Ok");
                      }
              }
      }
}