WPF C#

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  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="WpfApplication1.IndexOfSample" 
  WindowTitle="UIElementCollection IndexOf Sample">
    
        
        What is the Index Number
            of the Element Just Added?
        
            Text 1
            Text 2
        
    

//File:Window.xaml.cs
namespace WpfApplication1 {
    using System.Windows;
    using System.Windows.Controls;
    using System.Windows.Documents;
    public partial class IndexOfSample {
    
    void FindIndex(object sender, RoutedEventArgs e)
    {
      TextBlock newText = new TextBlock();
      MainDisplayPanel.Children.Add(newText);
      newText.Text = "New element #" ;
      DockPanel.SetDock(newText,Dock.Top);
      TxtDisplay.Text = MainDisplayPanel.Children.IndexOf(newText)+"";
    }
  }
}