Storyboard to make textblock bigger

Try this

            <TextBlock Name="txtBlock">Test</TextBlock>

 DoubleAnimation expand = new DoubleAnimation();
                expand.From = 20;
                expand.To = 300;
                Storyboard.SetTargetProperty(expand, "(TextBlock.FontSize)");
                Storyboard.SetTarget(expand, txtBlock);
                expand.EnableDependentAnimation = true; // This is needed for this kind of animation to work.
                Storyboard sbText = new Storyboard();
                sbText.Children.Add(expand);
                sbText.Begin();

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Thanks,

Sachin

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