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Bind to an Existing Object Instance

<UserControl x:Class='SilverlightApplication3.MainPage'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'      xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'     xmlns:d='http://schemas.microsoft.com/expression/blend/2008'      xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'      mc:Ignorable='d'      d:DesignWidth='640'      d:DesignHeight='480'>     <Grid Margin="4">         <Grid.ColumnDefinitions>             <ColumnDefinition Width="80"/>             <ColumnDefinition Width="*"/>         </Grid.ColumnDefinitions>         <Grid.RowDefinitions>             <RowDefinition Height="30"/>             <RowDefinition Height="30"/>             <RowDefinition Height="30"/>         </Grid.RowDefinitions>         <TextBlock Margin="4" Text="First Name" VerticalAlignment="Center"/>         <TextBox Margin="4" Text="{Binding Path=FirstName}"                  Grid.Column="1"/>                  <TextBlock Margin="4" Text="Last Name" Grid.Row="1" VerticalAlignment="Center"/>         <TextBox Margin="4" Text="{Binding Path=LastName}"                  Grid.Column="1"                  Grid.Row="1"/>                  <TextBlock Margin="4" Text="Age" Grid.Row="2" VerticalAlignment="Center"/>         <TextBox Margin="4" Text="{Binding Path=Age}"                  Grid.Column="1"                  Grid.Row="2"/>     </Grid> </UserControl> //File:Window.xaml.cs using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; namespace SilverlightApplication3 {     public partial class MainPage : UserControl     {         public MainPage()         {             InitializeComponent();             this.DataContext = new Employee()                                    {                                        FirstName = "A",                                        LastName = "B",                                        Age = 26                                    };         }     }     public class Employee     {         public string FirstName { get; set; }         public string LastName { get; set; }         public int Age { get; set; }     } }