Window1.xaml.cs

using System;
using System.Globalization;
using System.Windows;
using System.Windows.Media;

namespace SDKSample
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>

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

        // <SnippetDrawTextToControlBackground1>
        // Handle the WindowLoaded event for the window.
        private void WindowLoaded(object sender, EventArgs e)
        {
            // Update the background property of the label and button.
            myLabel.Background = new DrawingBrush(DrawMyText("My Custom Label"));
            myButton.Background = new DrawingBrush(DrawMyText("Display Text"));
        }

        // Convert the text string to a geometry and draw it to the control's DrawingContext.
        private Drawing DrawMyText(string textString)
        {
            // Create a new DrawingGroup of the control.
            DrawingGroup drawingGroup = new DrawingGroup();

            // Open the DrawingGroup in order to access the DrawingContext.
            using (DrawingContext drawingContext = drawingGroup.Open())
            {
                // Create the formatted text based on the properties set.
                FormattedText formattedText = new FormattedText(
                    textString,
                    CultureInfo.GetCultureInfo("en-us"),
                    FlowDirection.LeftToRight,
                    new Typeface("Comic Sans MS Bold"),
                    48,
                    System.Windows.Media.Brushes.Black, // This brush does not matter since we use the geometry of the text.
                    VisualTreeHelper.GetDpi(this).PixelsPerDip);

                // Build the geometry object that represents the text.
                Geometry textGeometry = formattedText.BuildGeometry(new System.Windows.Point(20, 0));

                // Draw a rounded rectangle under the text that is slightly larger than the text.
                drawingContext.DrawRoundedRectangle(System.Windows.Media.Brushes.PapayaWhip, null, new Rect(new System.Windows.Size(formattedText.Width + 50, formattedText.Height + 5)), 5.0, 5.0);

                // Draw the outline based on the properties that are set.
                drawingContext.DrawGeometry(System.Windows.Media.Brushes.Gold, new System.Windows.Media.Pen(System.Windows.Media.Brushes.Maroon, 1.5), textGeometry);

                // Return the updated DrawingGroup content to be used by the control.
                return drawingGroup;
            }
        }
        // </SnippetDrawTextToControlBackground1>

        // Handle the Click event for the button.
        private void OnButtonClick(object sender, EventArgs e)
        {
            // Update the background property of the canvas.
            myCanvas.Background = new DrawingBrush(DrawMyText(myTextBox.Text));
        }
    }
}