<Window
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:c="clr-namespace:WpfApplication1"
  x:Class="WpfApplication1.Window1"
  Title="Binding Validation Sample"
  SizeToContent="WidthAndHeight"
  ResizeMode="NoResize">
    <Window.Resources>
        <c:MyDataSource x:Key="ods"/>

    </Window.Resources>
    <StackPanel>
        <TextBox Name="textBox2" Width="50" FontSize="15">
            <TextBox.Text>
                <Binding Path="Age2" Source="{StaticResource ods}" UpdateSourceTrigger="PropertyChanged" >
                    <Binding.ValidationRules>
                        <c:AgeRangeRule Min="21" Max="30"/>
                    </Binding.ValidationRules>
                </Binding>
            </TextBox.Text>
        </TextBox>

    </StackPanel>
</Window>

//File:Window.xaml.cs
using System;
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Data;
using System.Globalization;
using System.Collections.ObjectModel;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
    }
    public class AgeRangeRule : ValidationRule
    {
        private int _min;
        private int _max;

        public AgeRangeRule()
        {
        }

        public int Min
        {
            get { return _min; }
            set { _min = value; }
        }

        public int Max
        {
            get { return _max; }
            set { _max = value; }
        }

        public override ValidationResult Validate(object value, CultureInfo cultureInfo)
        {
            int age = 0;

            try
            {
                if (((string)value).Length > 0)
                    age = Int32.Parse((String)value);
            }
            catch (Exception e)
            {
                return new ValidationResult(false, "Illegal characters or " + e.Message);
            }

            if ((age < Min) || (age > Max))
            {
                return new ValidationResult(false,
                  "Please enter an age in the range: " + Min + " - " + Max + ".");
            }
            else
            {
                return new ValidationResult(true, null);
            }
        }
    }

    public class MyDataSource
    {
        private int _age;
        private int _age2;
        private int _age3;

        public MyDataSource()
        {
            Age = 0;
            Age2 = 0;
        }

        public int Age
        {
            get { return _age; }
            set { _age = value; }
        }
        public int Age2
        {
            get { return _age2; }
            set { _age2 = value; }
        }

        public int Age3
        {
            get { return _age3; }
            set { _age3 = value; }
        }
    }
}

   
    
     

   
  

<Window x:Class="TunnelingBubbling.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="TunnelingBubbling">
  
    <Grid MouseLeftButtonDown="MouseDownGrid"
          PreviewMouseLeftButtonDown="PreviewMouseDownGrid"
      Width="300" Height="300">

    <Button PreviewMouseLeftButtonDown="PreviewMouseDownButton"
      MouseLeftButtonDown="MouseDownButton"
      Click="MyClickEvent"
      Name="btnGo">

      <TextBox MouseLeftButtonDown="MouseLeftButtonDown"
        PreviewMouseLeftButtonDown="PreviewMouseLeftButtonDown"
        Width="200" Height="30" Name="textBox1">
      </TextBox>
    </Button>
  </Grid>  
</Window>
//File:Window.xaml.cs

using System;
using System.Collections.Generic;
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.Shapes;
using System.Diagnostics;

namespace TunnelingBubbling
{
    public partial class Window1 : System.Windows.Window
    {

        public Window1()
        {
            InitializeComponent();
        }

        private void PreviewMouseDownGrid(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine("PreviewMouseDownGrid");
        }

        private void PreviewMouseDownButton(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine("PreviewMouseDownButton");
        }

        private void PreviewMouseLeftButtonDown(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine("PreviewMouseLeftButtonDown");
        }

        private void MyClickEvent(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine("MyClickEvent");
        }

        private void MouseLeftButtonDown(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine("MouseLeftButtonDown");
        }

        private void MouseDownButton(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine("MouseDownButton");
        }

        private void MouseDownGrid(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine("MouseDownGrid");
        }

    }
}

   
    
     

   
  

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="BindingWithFallback" Height="300" Width="300">
    <StackPanel>
      <TextBox Text="{Binding Path=FastProperty, Mode=OneWay}" IsReadOnly="True" />
    </StackPanel>
</Window>

//File:Window.xaml.cs
using System;
using System.Collections.Generic;
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.Shapes;


namespace WpfApplication1{

  class MyClass {
    public string FastProperty { get { return "AAA"; } }
  }

  public partial class Window1 : System.Windows.Window {

    public Window1() {
      InitializeComponent();
      DataContext = new MyClass();
    }

  }
}

   
    
     

   
  

<Window x:Class="WpfApplication1.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title=" " Height="300" Width="300" Loaded="Window1_Loaded">
  <Grid>
    <Viewbox>
      <TextBox x:Name="tbxEditMe" Text="Edit Me..." />
    </Viewbox>      
  </Grid>
</Window>


//File:Window.xaml.cs
using System;
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void Window1_Loaded(object sender, RoutedEventArgs e)
        {
            DependencyPropertyDescriptor descriptor = DependencyPropertyDescriptor.FromProperty(TextBox.TextProperty, typeof(TextBox));
            descriptor.AddValueChanged(tbxEditMe, tbxEditMe_TextChanged);
            
        }

        private void tbxEditMe_TextChanged(object sender, EventArgs e)
        {
            MessageBox.Show("", "changed");
        }
    }
}

   
    
     

   
     

<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="160" Width="300">
    <Grid>
            <TextBlock Foreground="DarkGray" 
                       VerticalAlignment="Center" 
                       HorizontalAlignment="Center"
                       ToolTip="This is a custom tooltip"
                       Text="Mouse Over for tooltip"/>
    </Grid>
    
</Window>

   
    
    
    
    
     

   
     

<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="160" Width="300">
    <Grid>
        <Border Margin="8" 
                BorderThickness="1"
                BorderBrush="Black"
                Width="160" 
                Height="60">
            <TextBlock Foreground="DarkGray" 
                       VerticalAlignment="Center" 
                       HorizontalAlignment="Center"
                       ToolTip="This is a custom tooltip"
                       Text="Mouse Over for tooltip"/>
        </Border>
    </Grid>
    
</Window>

   
    
    
    
    
     

   
      

<Canvas xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Canvas.Resources>
        <Style TargetType="{x:Type TextBlock}">
            <Setter Property="FontFamily" Value="Times New Roman" />
            <Setter Property="FontSize" Value="144" />
            <Setter Property="Text" Value="Shadow" />
            <Setter Property="Canvas.Left" Value="96" />
            <Setter Property="Canvas.Top" Value="192" />
        </Style>
    </Canvas.Resources>

    <!-- Shadow Text. -->

    <TextBlock Foreground="DarkGray">
        <TextBlock.RenderTransform>
            <TransformGroup>
                <ScaleTransform ScaleY="3" CenterY="100" />
                <SkewTransform AngleX="-45" CenterY="100" />
            </TransformGroup>
        </TextBlock.RenderTransform>
    </TextBlock>

    <!-- Foreground Text. -->

    <TextBlock />
</Canvas>