Get selected item count from Listbox

     
<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

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

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