Get selected item count from Listbox : ListBox Selection « Windows Presentation Foundation « VB.Net Tutorial

1. VB.Net Tutorial
2. Windows Presentation Foundation
3. ListBox Selection

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        x:Class="AboutDialog" ListBox.SelectionChanged="ListBox_SelectionChanged"
        Button.Click="Button_Click"
        Title="About WPF Unleashed" SizeToContent="WidthAndHeight"
        Background="OrangeRed">
  <StackPanel>
    <Label FontWeight="Bold" FontSize="20" Foreground="White">
      WPF
    </Label>
    <Label>License</Label>
    <Label>Installed Dll:</Label>
    <ListBox>
      <ListBoxItem>1</ListBoxItem>
      <ListBoxItem>2</ListBoxItem>
      <ListBoxItem>3</ListBoxItem>
      <ListBoxItem>4</ListBoxItem>
      <ListBoxItem>5</ListBoxItem>
      <ListBoxItem>6</ListBoxItem>
      <ListBoxItem>7</ListBoxItem>
      <ListBoxItem>8</ListBoxItem>
      <ListBoxItem>9</ListBoxItem>
    </ListBox>
    <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
      <Button MinWidth="75" Margin="10">Help</Button>
      <Button MinWidth="75" Margin="10">OK</Button>
    </StackPanel>
    <StatusBar>test</StatusBar>
  </StackPanel>
</Window>
//File:Window.xaml.vb
Imports System.Windows
Imports System.Windows.Controls

Public Partial Class AboutDialog
  Inherits Window
  Public Sub New()
    InitializeComponent()
  End Sub

  Private Sub ListBox_SelectionChanged(sender As Object, e As SelectionChangedEventArgs)
    If e.AddedItems.Count > 0 Then
      MessageBox.Show("You just selected " & Convert.ToString(e.AddedItems(0)))
    End If
  End Sub

  Private Sub Button_Click(sender As Object, e As RoutedEventArgs)
    MessageBox.Show("You just clicked " & Convert.ToString(e.Source))
  End Sub
End Class

16.30.ListBox Selection
	16.30.1.	Set selected index for ListBox
	16.30.2.	ListBox Selected Index, Item, Value
	16.30.3.	ListBox and SelectionMode
	16.30.4.	Get selected item from ListBox
	16.30.5.	Get selected item count from Listbox
	16.30.6.	View and Select Items Using a List
	16.30.7.	Set text to TextBlock for selected list item
	16.30.8.	Select All and unselect all
	16.30.9.	Get Selected Item from ListBox 2
	16.30.10.	Select All ListBox Items
	16.30.11.	This list box allows multiple user selections.
	16.30.12.	ListBox SelectionMode=Single
	16.30.13.	ListBox selection changed event