WPF_Practice/PacticeSolution/ObervableCollectionSample/MainWindow.xaml

<Window x:Class="ObervableCollectionSample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:ObervableCollectionSample"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Window.DataContext>
        <local:PersonCollection/>
    </Window.DataContext>
    
    <StackPanel>
        <ListView ItemsSource="{Binding}">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <StackPanel>
                        <TextBlock Text="{Binding Name}"/>
                    </StackPanel>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
        <Button Content="Add" Click="Button_Click"/>

        <ComboBox x:Name="cboMain" ItemsSource="{Binding}" SelectedValuePath="Age">
            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Name}"/>
                </DataTemplate>
            </ComboBox.ItemTemplate>
        </ComboBox>
        <Button Content="Check" Click="Button_Click_1"/>
    </StackPanel>
</Window>