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    <p>This is possible through Binding like so:</p> <pre><code> &lt;TextBox Width="50" Height="20" VerticalAlignment="Top" Text="{Binding Path=Text, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/&gt; &lt;Grid Width="100" Height="100" Background="Gray" x:Name="Grid"&gt; &lt;Line Grid.Row="1" X2="100" Y2="100" Stroke="Red"&gt; &lt;Line.RenderTransform&gt; &lt;RotateTransform CenterX="50" CenterY="50" Angle="{Binding Path=Text, Mode=OneWay, Converter={StaticResource ResourceKey=SToD}}"/&gt; &lt;/Line.RenderTransform&gt; &lt;/Line&gt; &lt;/Grid&gt; </code></pre> <p>Your converter simply has to convert your string to a double <code>return System.Convert(value.ToString());</code>.</p> <p>A cool feature I discovered while testing this, is that a validation rule is automatically added which returns an ValidationError if you dont type a double value into your TextBox.</p> <p>To make this work you have to the the MainWindows DataContext to itself with <code>this.DataContext = this;</code>.</p> <p>EDIT: I wrote a little Helper class, which does the Animation for you:</p> <pre><code>public class DoubleAnimationManager { private static Dictionary&lt;DependencyObject, AnimationHelper&gt; _helperDic = new Dictionary&lt;DependencyObject, AnimationHelper&gt;(); public static PropertyPath GetProperty(DependencyObject obj) { return (PropertyPath)obj.GetValue(PropertyProperty); } public static void SetProperty(DependencyObject obj, PropertyPath value) { obj.SetValue(PropertyProperty, value); } public static readonly DependencyProperty PropertyProperty = DependencyProperty.RegisterAttached( "Property", typeof(PropertyPath), typeof(DoubleAnimationManager), new PropertyMetadata( (o, e) =&gt; { if (!_helperDic.ContainsKey(o)) _helperDic[o] = new AnimationHelper(o); _helperDic[o].Path = (PropertyPath)e.NewValue; })); public static int GetDelayTimeInMS(DependencyObject obj) { return (int)obj.GetValue(DelayTimeInMSProperty); } public static void SetDelayTimeInMS(DependencyObject obj, int value) { obj.SetValue(DelayTimeInMSProperty, value); } public static readonly DependencyProperty DelayTimeInMSProperty = DependencyProperty.RegisterAttached( "DelayTimeInMS", typeof(int), typeof(DoubleAnimationManager), new PropertyMetadata(0, (o, e) =&gt; { if (!_helperDic.ContainsKey(o)) _helperDic[o] = new AnimationHelper(o); _helperDic[o].DelayInMS = (int)e.NewValue; })); public static double GetValue(DependencyObject obj) { return (double)obj.GetValue(ValueProperty); } public static void SetValue(DependencyObject obj, double value) { obj.SetValue(ValueProperty, value); } public static readonly DependencyProperty ValueProperty = DependencyProperty.RegisterAttached( "Value", typeof(double), typeof(DoubleAnimationManager), new PropertyMetadata( (o, e) =&gt; { if (!_helperDic.ContainsKey(o)) _helperDic[o] = new AnimationHelper(o); _helperDic[o].ToValue = (double)e.NewValue; if (!_helperDic[o].Started) { _helperDic[o].FromValue = (double)e.OldValue; _helperDic[o].Start(); } })); } public class AnimationHelper { private bool _remMode; private DependencyObject _target; private BackgroundWorker _bw = new BackgroundWorker(); public double FromValue { get; set; } private double _toValue; public double ToValue { get { return _toValue; } set { if (Started) { _remMode = true; } _toValue = value; } } public bool Started { get; private set; } private int _delayInMS; public int DelayInMS { get { return _delayInMS; } set { _delayInMS = value; } } public PropertyPath Path { get; set; } public AnimationHelper(DependencyObject target) { _target = target; _bw.DoWork += delegate { System.Threading.Thread.Sleep(DelayInMS); }; _bw.RunWorkerCompleted += delegate { StartAnimation(); }; } private Storyboard GetStoryboard() { Storyboard sb = new Storyboard(); DoubleAnimation da = new DoubleAnimation(ToValue, new TimeSpan(0, 0, 3)); da.From = FromValue; Storyboard.SetTarget(da, _target); Storyboard.SetTargetProperty(da, Path); sb.Children.Add(da); sb.Completed += delegate { if (_remMode) { StartAnimation(); _remMode = false; } else { Started = false; } }; return sb; } private void StartAnimation() { GetStoryboard().Begin(); FromValue = ToValue; } public void Start() { Started = true; _bw.RunWorkerAsync(); } } </code></pre> <p>How to use it:</p> <pre><code> &lt;TextBox Width="50" Height="20" VerticalAlignment="Top" Text="{Binding Path=Text, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/&gt; &lt;Grid Width="100" Height="100" Background="Gray" x:Name="Grid"&gt; &lt;Line Grid.Row="1" X2="100" Y2="100" Stroke="Red" local:DoubleAnimationManager.Property="(UIElement.RenderTransform).(RotateTransform.Angle)" local:DoubleAnimationManager.Value="{Binding Path=Text, Mode=OneWay, Converter={StaticResource ResourceKey=SToD}}"&gt; &lt;Line.RenderTransform&gt; &lt;RotateTransform CenterX="50" CenterY="50"/&gt; &lt;/Line.RenderTransform&gt; &lt;/Line&gt; &lt;/Grid&gt; </code></pre>
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    1. USFlorian Gl
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    1. COThank you for your answer, it is definitely helpful, however it doesn't mention animations - what is the best way to make the transition animated?
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      1. USNikolas Jíša
    2. COHave a look at my edit ;)
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