Window 8.1 app development

Question

I have use sqlite and visualstudio 2015. I have displayed the required data using listview.

Now i want to display data of only the selected item in listview when i click the display the data(Button).

 

when i click showdata button(btnAdd_Click) listview is displayed.

 

Display.xaml

<Grid Background="Gray">
<Button x:Name="btn" Click="btnAdd_Click" Content="Showdata" Width="200" Margin="900,43,0,687" Background="#FF040404" />
<ListView Header="Detailss" x:Name="myList" HorizontalAlignment="Left">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Vertical" Height="150" Width="200" Background="White">
<TextBlock x:Name="username" HorizontalAlignment="Left" Text="{Binding Username}" TextWrapping="Wrap" Foreground="Black" />
<TextBlock x:Name="password" Text="{Binding Password}" TextWrapping="Wrap" Foreground="Black" />
<TextBlock x:Name="name" Text="{Binding Name}" TextWrapping="Wrap" Foreground="Black" />
<TextBlock x:Name="address" Text="{Binding Address}" TextWrapping="Wrap" Foreground="Black"/>
<Button x:Name="btn1" Content="Display This Data" Background="#FFA68A8A" Foreground="#FF060606" Click="btn1Add_Click"/>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>

 

Display.xaml.cs

string DB_Path = Path.Combine(Windows.Storage.ApplicationData.Current.LocalFolder.Path, "Winapp.sqlite");
private void btnAdd_Click(object sender, RoutedEventArgs e)
{
ObservableCollection<RegisterTable> obsregtable = new ObservableCollection<RegisterTable>();
using (SQLite.Net.SQLiteConnection conn = new SQLite.Net.SQLiteConnection(new SQLite.Net.Platform.WinRT.SQLitePlatformWinRT(), DB_Path))
{
List<RegisterTable> RegisterData = conn.Query<RegisterTable>("select * from RegisterTable");
foreach (var item in RegisterData)
{
obsregtable.Add(new RegisterTable() { Id = item.Id, Name = item.Name, Username = item.Username, Password = item.Password, Address = item.Address });
}
myList.ItemsSource = obsregtable;
}
private async void btn1Add_Click(object sender, RoutedEventArgs e)
{
}