what is dependency properties in wpf

The dependency property
While you using the dependency property it makes the most sense in elements-classes that have a visual appearance (UIelements).

Pros:

1) WPF do the logic stuff for you
2) Some mechanism like animation use only dependency property
3) 'Fits' ViewModel style

Cons:

1) You need to derive form DependencyObject
2) A bit awkward for simple stuff

Sample:

public static class StoryBoardHelper
{
    public static DependencyObject GetTarget(Timeline timeline)
    {
        if (timeline == null)
            throw new ArgumentNullException("timeline");

        return timeline.GetValue(TargetProperty) as DependencyObject;
    }

    public static void SetTarget(Timeline timeline, DependencyObject value)
    {
        if (timeline == null)
            throw new ArgumentNullException("timeline");

        timeline.SetValue(TargetProperty, value);
    }

    public static readonly DependencyProperty TargetProperty =
            DependencyProperty.RegisterAttached(
                    "Target",
                    typeof(DependencyObject),
                    typeof(Timeline),
                    new PropertyMetadata(null, OnTargetPropertyChanged));

    private static void OnTargetPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        Storyboard.SetTarget(d as Timeline, e.NewValue as DependencyObject);
    }
}

Refer
http://www.codeproject.com/Articles/140620/WPF-Tutorial-Dependency-Property
http://stackoverflow.com/questions/3551204/when-to-use-a-wpf-dependency-property-versus-inotifypropertychanged

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Chandu
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References:
http://www.developerfusion.com/article/84469/wpf-dependency-properties/
http://stackoverflow.com/questions/1723756/why-dependency-properties
http://stackoverflow.com/questions/771833/how-to-bind-to-a-wpf-dependency-property-when-the-datacontext-of-the-page-is-use

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Chandu
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