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Get selected item from ListBox

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         x:Class="MyNameSpace.CompileXamlWindow.CompileXamlWindow"         Title="Compile XAML Window"          SizeToContent="WidthAndHeight"          ResizeMode="CanMinimize">     <StackPanel>         <Button HorizontalAlignment="Center" Margin="24" Click="ButtonOnClick">             Click         </Button>         <Ellipse Name="elips" Width="200" Height="100" Margin="24" Stroke="Black"/>         <ListBox Name="lstbox" Width="150" Height="150" Margin="24" SelectionChanged="ListBoxOnSelection" />     </StackPanel> </Window> //File:Window.xaml.cs using System; using System.Reflection; using System.Windows; using System.Windows.Controls; using System.Windows.Input; using System.Windows.Media; namespace MyNameSpace.CompileXamlWindow {     public partial class CompileXamlWindow : Window     {         public CompileXamlWindow()         {             InitializeComponent();                          foreach (PropertyInfo prop in typeof(Brushes).GetProperties())                 lstbox.Items.Add(prop.Name);         }         void ButtonOnClick(object sender, RoutedEventArgs args)         {             Button btn = sender as Button;             MessageBox.Show(btn.Content + "' has been clicked.");         }         void ListBoxOnSelection(object sender, SelectionChangedEventArgs args)         {             ListBox lstbox = sender as ListBox;             string strItem = lstbox.SelectedItem as string;             PropertyInfo prop = typeof(Brushes).GetProperty(strItem);             elips.Fill = (Brush)prop.GetValue(null, null);         }     } }