Blinking animation for an image

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C#3.0

C#

Hi All,

I am using following code for an image animation(blinking).But problem is I am not able to control its blinking time.I want it such a way that one funcion will start it and another function will stop it.

if anyone has another idea or code.please share with me.

Storyboard sb = new Storyboard();
     DoubleAnimation oa = new DoubleAnimation();
     oa.Duration = new Duration(TimeSpan.FromSeconds(0.5));
     oa.From = 1;
     oa.To = 0.2;
     Storyboard.SetTarget(oa, img);
     Storyboard.SetTargetProperty(oa, new PropertyPath(Image.OpacityProperty));
     oa.AutoReverse = true;
     oa.RepeatBehavior = RepeatBehavior.Forever;
     sb.Children.Add(oa);
     sb.Begin();

Thanks.