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Bind to an Existing Object Instance

<Window x:Class="WpfApplication1.Window1"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="WPF" Height="140" Width="300">     <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> </Window> //File:Window.xaml.cs using System.Windows; namespace WpfApplication1 {     public partial class Window1 : Window     {         public Window1()         {             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; }     } }