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copied!<p><strong>Update</strong><br> Did some more thinking about this problem. You can just bind the value :) This will both validate the color and set it. An invalid value will use the FallbackValue White.</p> <pre><code><Rectangle Fill="{Binding ElementName=textBox, Path=Text, FallbackValue=White}"/> <TextBox Name="textBox" Text="Green"/> </code></pre> <p>And if you need to have methods like IsColorValid and GetColorFromValue in code behind you can use Bindings there as well like this</p> <pre><code>private bool IsValidColor(string colorValue) { if (colorValue == "White" || colorValue == "#FFF" || colorValue == "#FFFF" || colorValue == "#FFFFFF" || colorValue == "#FFFFFFFF") { return true; } Brush fallbackBrush = new SolidColorBrush(Colors.White); Rectangle validationRectangle = new Rectangle(); Binding validationBinding = new Binding(); validationBinding.Source = colorValue; validationBinding.FallbackValue = fallbackBrush; validationRectangle.SetBinding(Rectangle.FillProperty, validationBinding); if (validationRectangle.Fill == fallbackBrush) { return false; } return true; } private Color GetColorFromValue(string colorValue) { Rectangle validationRectangle = new Rectangle(); Binding validationBinding = new Binding(); validationBinding.Source = colorValue; validationBinding.FallbackValue = new SolidColorBrush(Colors.White); validationRectangle.SetBinding(Rectangle.FillProperty, validationBinding); return ((SolidColorBrush)validationRectangle.Fill).Color; } </code></pre>

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