<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" Loaded="WindowLoaded"> <StackPanel> <TextBlock Name="baselineTextBlock" FontSize="24" Width="180" VerticalAlignment="Center">The lazy dog</TextBlock> </StackPanel> </Window> //File:Window.xaml.cs using System; using System.Windows; using System.Windows.Media; namespace TextDecorationExample { public partial class Window1 : Window { private void WindowLoaded(object sender, EventArgs e) { // Fill the baseline decoration with a linear gradient brush. TextDecorationCollection myCollection = new TextDecorationCollection(); TextDecoration myBaseline = new TextDecoration(); myBaseline.Location = TextDecorationLocation.Baseline; // Set the linear gradient brush. Pen myPen = new Pen(); myPen.Brush = new LinearGradientBrush(Colors.Orange, Colors.Red, 0); myPen.Thickness = 3; myBaseline.Pen = myPen; myBaseline.PenThicknessUnit = TextDecorationUnit.FontRecommended; // Set the baseline decoration to the text block. myCollection.Add(myBaseline); baselineTextBlock.TextDecorations = myCollection; } } }