You have your WPF Window and you have an object that you don’t want to make a static resource. You want to declare it as a member variable in the code.

Example 1 – Binding two TextBox controls to a Person object

1. Create a New WPF Application Visual Studio.
2. Create a new Class named Person.cs.
3. Give it FirstName and a LastName properties.
4. Configure it to implement the INotifyPropertyChanged interface.
5. Create a NotifyPropertyChanged function that all properties can share (to avoid duplicate code in every single property).
6. Configure the properties to call the NotifyPropertyChanged function passing in a string that is the name of the property.

   Person.cs

   using System;
   using System.ComponentModel;
   
   namespace WPFPerson
   {
       public class Person : INotifyPropertyChanged
       {
           #region Member Variables
           String _FirstName;
           String _LastName;
           #endregion
   
           #region Constructors
           /*
   		 * The default constructor
    		 */
           public Person()
           {
           }
           #endregion
   
           #region Properties
           public String FirstName
           {
               get { return _FirstName; }
               set
               {
                   _FirstName = value;
                   NotifyPropertyChanged("FirstName");
               }
           }
   
           public String LastName
           {
               get { return _LastName; }
               set
               {
                   _LastName = value;
                   NotifyPropertyChanged("LastName");
               }
           }
           #endregion
   
           #region INotifyPropertyChanged Members
           public event PropertyChangedEventHandler PropertyChanged;
   
           private void NotifyPropertyChanged(String info)
           {
               if (PropertyChanged != null)
               {
                   PropertyChanged(this, new PropertyChangedEventArgs(info));
               }
           }
           #endregion
       }
   }
   

7. Go back tot he MainWindow.xaml.
8. Add two labels, and two text boxes, and a button.
9. Change the text boxes to be populated using binding by adding the following text:
   Text=”{Binding FirstName, Mode=TwoWay}”  

   MainWindow.xaml (WPF Window)

   <window x:Class="WPFPerson.MainWindow"
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
           Title="MainWindow" Height="350" Width="525" >
       <grid Name="PersonGrid" >
           <textBox Height="23" HorizontalAlignment="Left" Margin="173,87,0,0" Name="textBoxFirstName" VerticalAlignment="Top" Width="234" Text="{Binding FirstName, Mode=TwoWay}" />
           <textBox Height="23" HorizontalAlignment="Left" Margin="173,116,0,0" Name="textBoxLastName" VerticalAlignment="Top" Width="234" Text="{Binding LastName, Mode=TwoWay}"/>
           <label Content="FirstName" Height="28" HorizontalAlignment="Left" Margin="103,85,0,0" Name="labelFirstName" VerticalAlignment="Top" />
           <label Content="LastName" Height="28" HorizontalAlignment="Left" Margin="103,114,0,0" Name="labelLastName" VerticalAlignment="Top" />
           <button Content="Defaults" Height="23" HorizontalAlignment="Left" Margin="337,199,0,0" Name="buttonDefaults" VerticalAlignment="Top" Width="75" Click="buttonDefaults_Click" />
       </grid>
   </window>
   

10. Double-click the button to create the buttonDefaults_Click event function.
    This also conveniently takes you to the Code Behind of the MainWindow.cs file.
11. Have the buttonDefaults_Click function update to properties of your _Person object.
    _Person.FirstName = “Jared”;
    _Person.LastName = “Barneck”;
12. Create a field/member variable using the Person object.
    private readonly Person _Person;
13. Now in the constructor initialize the object.
    _Person = new Person();
14. Also in the constructor, make the DataContext for each TextBox the _Person object.
    textBoxFirstName.DataContext = _Person;
    textBoxLastName.DataContext = _Person;  

    MainWindow.cs (Code Behind)

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Windows;
    using System.Windows.Controls;
    using System.Windows.Data;
    using System.Windows.Documents;
    using System.Windows.Input;
    using System.Windows.Media;
    using System.Windows.Media.Imaging;
    using System.Windows.Navigation;
    using System.Windows.Shapes;
    using System.Threading;
    
    namespace WPFPerson
    {
        /// <summary>
        /// Interaction logic for MainWindow.xaml
        /// </summary>
        public partial class MainWindow : Window
        {
            private readonly Person _Person;
    
            public MainWindow()
            {
                _Person = new Person();
                InitializeComponent();
                textBoxFirstName.DataContext = _Person;
                textBoxLastName.DataContext = _Person;
            }
    
            private void buttonDefaults_Click(object sender, RoutedEventArgs e)
            {
                _Person.FirstName = "Jared";
                _Person.LastName = "Barneck";
            }
        }
    }
    

15. Now Now compile and make sure you don’t have any errors.

Example 2 – Forthcoming…

Example 3 – Forthcoming…

Sources:
http://www.wrox.com/WileyCDA/Section/Windows-Presentation-Foundation-WPF-Data-Binding-with-C-2005.id-305562.html