<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="TextDecorationExample.Window1"
  Title="TextDecoration Example"
  Width="720"
  Height="400">
  <StackPanel>
      <TextBlock FontSize="24" Width="180" VerticalAlignment="Center">The lazy dog
        <TextBlock.TextDecorations>
          <TextDecoration Location="Underline" 
            PenThicknessUnit="FontRecommended">
            <TextDecoration.Pen>
              <Pen Brush="Red" Thickness="1" />
            </TextDecoration.Pen>
          </TextDecoration>
        </TextBlock.TextDecorations>
      </TextBlock>
  </StackPanel>
</Window>

   
     

   
 

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="TextDecorationExample.Window1"
  Title="TextDecoration Example"
  Width="720"
  Height="400">
  <StackPanel>
      <TextBlock FontSize="24" Width="180" VerticalAlignment="Center">The lazy dog
        <TextBlock.TextDecorations>
          <TextDecoration Location="Baseline" 
            PenThicknessUnit="FontRecommended">
            <TextDecoration.Pen>
              <Pen Thickness="3">
                <Pen.Brush>
                  <LinearGradientBrush Opacity="0.5"
                    StartPoint="0,0.5"  EndPoint="1,0.5">
                    <LinearGradientBrush.GradientStops>
                      <GradientStop Color="Orange" Offset="0" />
                      <GradientStop Color="Red" Offset="1" />
                    </LinearGradientBrush.GradientStops>
                  </LinearGradientBrush>
                </Pen.Brush>
              </Pen>
            </TextDecoration.Pen>
          </TextDecoration>
        </TextBlock.TextDecorations>
      </TextBlock>

  </StackPanel>
</Window>

   
     

   
 

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="TextDecorationExample.Window1"
  Title="TextDecoration Example"
  Width="720"
  Height="400">
  <StackPanel>
      <TextBlock FontSize="24" Width="180" VerticalAlignment="Center">The lazy dog
        <TextBlock.TextDecorations>
          <TextDecoration Location="Baseline" 
            PenThicknessUnit="FontRecommended">
            <TextDecoration.Pen>
              <Pen Thickness="3">
                 <Pen.DashStyle>
                    <DashStyle Dashes="0.5, 3, 1, 2" />
                 </Pen.DashStyle>
                <Pen.Brush>
                  <LinearGradientBrush Opacity="0.5"
                    StartPoint="0,0.5"  EndPoint="1,0.5">
                    <LinearGradientBrush.GradientStops>
                      <GradientStop Color="Orange" Offset="0" />
                      <GradientStop Color="Red" Offset="1" />
                    </LinearGradientBrush.GradientStops>
                  </LinearGradientBrush>
                </Pen.Brush>
              </Pen>
            </TextDecoration.Pen>
          </TextDecoration>
        </TextBlock.TextDecorations>
      </TextBlock>

  </StackPanel>
</Window>

   
     

   
 

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="TextDecorationExample.Window1"
  Title="TextDecoration Example"
  Width="720"
  Height="400">
  <StackPanel>
      <TextBlock FontSize="24" Width="180" VerticalAlignment="Center">The lazy dog
        <TextBlock.TextDecorations>
          <TextDecoration Location="OverLine" 
            PenThicknessUnit="FontRecommended">
            <TextDecoration.Pen>
              <Pen Thickness="3">
                <Pen.Brush>
                  <LinearGradientBrush 
                    StartPoint="0,0.5"  EndPoint="1,0.5">
                    <LinearGradientBrush.GradientStops>
                      <GradientStop Color="LimeGreen" Offset="0" />
                      <GradientStop Color="Yellow" Offset="1" />
                    </LinearGradientBrush.GradientStops>
                  </LinearGradientBrush>
                </Pen.Brush>
                <Pen.DashStyle>
                   <DashStyle  Dashes="0.5, 3, 1, 2" />
                </Pen.DashStyle>
              </Pen>
            </TextDecoration.Pen>
          </TextDecoration>
        </TextBlock.TextDecorations>
      </TextBlock>

  </StackPanel>
</Window>

   
     

   
 

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="TextDecorationExample.Window1"
  Title="TextDecoration Example"
  Width="720"
  Height="400">
  <StackPanel>
      <TextBlock FontSize="24" Width="180" VerticalAlignment="Center">The lazy dog
        <TextBlock.TextDecorations>
          <TextDecoration Location="Strikethrough" 
            PenThicknessUnit="FontRecommended">
            <TextDecoration.Pen>
              <Pen Brush="Blue" Thickness="1">
                 <Pen.DashStyle>
                    <DashStyle Dashes="1 2" />
                 </Pen.DashStyle>
              </Pen>
            </TextDecoration.Pen>
          </TextDecoration>
        </TextBlock.TextDecorations>
      </TextBlock>

  </StackPanel>
</Window>

   
     

   
 

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  x:Class="TextDecorationExample.Window1"
  Title="TextDecoration Example"
  Width="720"
  Height="400">
  <StackPanel>
      <TextBlock FontSize="24" Width="180" VerticalAlignment="Center">
        The lazy dog
        <TextBlock.TextDecorations>
          <TextDecoration Location="Underline" 
            PenThicknessUnit="FontRecommended">
            <TextDecoration.Pen>
              <Pen Brush="Red" Thickness="1">
                <Pen.DashStyle>
                  <DashStyle Dashes="5"/>
                </Pen.DashStyle>
              </Pen>
            </TextDecoration.Pen>
          </TextDecoration>
        </TextBlock.TextDecorations>
      </TextBlock>

  </StackPanel>
</Window>

   
     

   
  
<Window x:Class="WpfApplication1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WpfApplication1" Height="225" Width="311" WindowStartupLocation="CenterScreen">
  <StackPanel>
    <TextBox  SpellCheck.IsEnabled ="True" AcceptsReturn ="True"
      Name ="txtData"  FontSize ="14"
      BorderBrush ="Blue" Height ="100">
    </TextBox>
    <Button Name ="btnOK" Content ="Get Selections" Width = "100" Click ="btnOK_Click"/>
  </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
{

  public partial class MainWindow : System.Windows.Window
  {
    public MainWindow()
    {
      InitializeComponent();
    }

    protected void btnOK_Click(object sender, RoutedEventArgs args)
    {
   
        string spellingHints = string.Empty;
        SpellingError error = txtData.GetSpellingError(txtData.CaretIndex);
        if (error != null)
        {
          foreach (string s in error.Suggestions)
          {
            spellingHints += string.Format("{0}
", s);

          }
          MessageBox.Show(spellingHints, "Try these instead");
        }

    }

  }
}