Listbox passing value to other window

Question

Hi corner,

 

Mainwindow.xaml

(ref*)

http://www.wpf-tutorial.com/dialogs/the-openfiledialog/     (Read in Multiple files)

private void Next_Click(object sender, RoutedEventArgs e)
{
   Window1 window1 = new Window1();
   window1.Show();
   this.Close();
}

<Button Click="btnOpenFiles_Click">Open files</Button>
<Button  Click="Next_Click" Content="NextWindow"/>
<ListBox Name="lbFiles" />

 

Window1.xaml

private void Back_Button(object sender, RoutedEventArgs e)
{
   MainWindow main = new MainWindow();
   main.Show();
   this.Close();
}
private void MessageBox_Button(object sender, RoutedEventArgs e)
{
} 

 

<Button Content="Back"   Click="Back_Button"/>
<Button Content="Message Box"  Click="MessageBox_Button"/> 

 

i am using multiple open files dialog with listbox (see in ref*). so How to listbox value to windows1 in messagebox_button function or any function?
Thanks