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Reference name defined in Xaml in cs file

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   x:Class="WpfApplication1.IndexOfSample"    WindowTitle="UIElementCollection IndexOf Sample">     <DockPanel Name="ParentElement">         <TextBlock DockPanel.Dock="Top" Name="TxtDisplay"></TextBlock>         <Button DockPanel.Dock="Top" Click="FindIndex">What is the Index Number             of the Element Just Added?</Button>         <DockPanel Name="MainDisplayPanel">             <TextBlock DockPanel.Dock="Top">Text 1</TextBlock>             <TextBlock DockPanel.Dock="Top">Text 2</TextBlock>         </DockPanel>     </DockPanel> </Page> //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)+"";     }   } }