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    <p>If you are not binding to a <code>DependencyProperty</code> or a object that implements <code>INotifyPropertyChanged</code> then the binding can leak memory, and you will have to unbind when you are done.</p> <p>This is because if the object is not a <code>DependencyProperty</code> or does not implement <code>INotifyPropertyChanged</code> then it uses the <code>ValueChanged</code> event via the <code>PropertyDescriptors</code> <code>AddValueChanged</code> method. This causes the CLR to create a strong reference from the <code>PropertyDescriptor</code> to the <code>object</code> and in most cases the CLR will keep a reference to the <code>PropertyDescriptor</code> in a global table. </p> <p>Because the binding must continue to listen for changes. This behavior keeps the reference alive between the <code>PropertyDescriptor</code> and the <code>object</code> as the target remains in use. This can cause a memory leak in the <code>object</code> and any <code>object</code> to which the <code>object</code> refers, This includes the data-binding target.</p> <p>So in short if you are binding to a <code>DependencyProperty</code> or <code>INotifyPropertyChanged</code> object then you should be ok, otherwise like any subscribed event you should unsubscribe your bindings</p> <hr> <p><strong>Edit:</strong> There is a possibility this was fixed in .NET4.5 using Weak Events/References, But after a few quick tests it seemed the same to me, I will have to dive in more deeply to confirm, so I'll personally say in <strong>might</strong> be fixed in 4.5 :)</p>
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    1. POCan bindings create memory leaks in WPF?
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    1. USJosh Crozier
    1. USsa_ddam213
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    1. COThis is a much better answer - I learned quite a bit here
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      1. USjdphenix
    2. CO@sa_ddam213: both the DP and INotifyPropertyChanged are safe for sure. Anyway, are you sure about the PD? I mean that the things should have turned fine on the latest .Net 4.5 framework, where the WeakEvent-pattern is used intensively.
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      1. USMario Vernari
    3. COI just double checked with .NET4.5 and it still seems to leak when PropertyDescriptor is used, If you want to confirm I used Jossef Goldberg's leak tested for WPF and recompiled to 4.5, link:http://blogs.msdn.com/b/jgoldb/archive/2008/02/04/finding-memory-leaks-in-wpf-based-applications.aspx, I have not tested to much into the leaks in 4.5 as the leaks in bindings in the previous framework versions changed my WPF coding habits permanently to avoid the issue :), I hope it is fixed and I will add disclaimer above about 4.5
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