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Group Data in a Collection

<Window x:Class="WpfApplication1.Window1"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"      xmlns:WpfApplication1="clr-namespace:WpfApplication1"      Title="WPF" Height="294" Width="160">     <Window.Resources>         <WpfApplication1:Countries x:Key="countries"/>         <CollectionViewSource x:Key="cvs" Source="{Binding Source={StaticResource countries}}">             <CollectionViewSource.GroupDescriptions>                 <PropertyGroupDescription PropertyName="Continent"/>             </CollectionViewSource.GroupDescriptions>         </CollectionViewSource>         <DataTemplate x:Key="groupingHeaderTemplate">             <Label VerticalAlignment="Center" Content="{Binding}" ></Label>         </DataTemplate>     </Window.Resources>     <Grid>         <ItemsControl ItemsSource="{Binding Source={StaticResource cvs}}" DisplayMemberPath="Name">             <ItemsControl.GroupStyle>                 <GroupStyle HeaderTemplate= "{StaticResource groupingHeaderTemplate}" />             </ItemsControl.GroupStyle>         </ItemsControl>     </Grid> </Window> //File:Window.xaml.cs using System.Collections.ObjectModel; namespace WpfApplication1 {     public class Country     {         private string name;         private Continent continent;         public Country(string name, Continent continent)         {             this.name = name;             this.continent = continent;         }         public string Name         {             get             {                 return name;             }             set             {                 name = value;             }         }         public Continent Continent         {             get             {                 return continent;             }             set             {                 continent = value;             }         }     }     public enum Continent     {         Europe,         NorthAmerica,     }     public class Countries : Collection<Country>     {         public Countries()         {             this.Add(new Country("Great Britan", Continent.Europe));             this.Add(new Country("USA", Continent.NorthAmerica));             this.Add(new Country("Canada", Continent.NorthAmerica));         }     } }