---
title: "How to: Change the Speed of a Clock Without Changing the Speed of Its Timeline"
ms.date: "03/30/2017"
dev_langs: 
  - "csharp"
  - "vb"
helpviewer_keywords: 
  - "speed of Clock [WPF], changing"
  - "clocks [WPF], changing speed of"
ms.assetid: 72f36dd0-f085-445d-8589-19a83fe74f5e
---
# How to: Change the Speed of a Clock Without Changing the Speed of Its Timeline
A <xref:System.Windows.Media.Animation.ClockController> object's <xref:System.Windows.Media.Animation.ClockController.SpeedRatio%2A> property enables you to change the speed of a <xref:System.Windows.Media.Animation.Clock> without altering the <xref:System.Windows.Media.Animation.Timeline.SpeedRatio%2A> of the clock's <xref:System.Windows.Media.Animation.Timeline>. In the following example, a <xref:System.Windows.Media.Animation.ClockController> is used to interactively modify the <xref:System.Windows.Media.Animation.ClockController.SpeedRatio%2A> of a clock. The <xref:System.Windows.Media.Animation.Clock.CurrentGlobalSpeedInvalidated> event and the clock's <xref:System.Windows.Media.Animation.Clock.CurrentGlobalSpeed%2A> property are used to display the clock's current global speed each time its interactive <xref:System.Windows.Media.Animation.ClockController.SpeedRatio%2A> is changed.  
  
## Example  
 [!code-csharp[timingbehaviors_procedural_snip#GraphicsMMClockControllerSpeedRatioExample](~/samples/snippets/csharp/VS_Snippets_Wpf/timingbehaviors_procedural_snip/CSharp/ClockControllerSpeedRatioExample.cs#graphicsmmclockcontrollerspeedratioexample)]
 [!code-vb[timingbehaviors_procedural_snip#GraphicsMMClockControllerSpeedRatioExample](~/samples/snippets/visualbasic/VS_Snippets_Wpf/timingbehaviors_procedural_snip/visualbasic/clockcontrollerspeedratioexample.vb#graphicsmmclockcontrollerspeedratioexample)]