ObservableCollection<T> now part of .NET 4 (No need to reference WPF) 22 March 2010 Peter-Himschoot .NET Development, VS2010, WPF/Silverlight ObservableCollection<T> is a generic collection added as part of WPF and Silverlight. WinForms has BindingList<T>. So writing code that targets both WinForms and WPF would mean using BindingList<T> (the common thing) and writing code targetting WPF and Silverlight would mean Observ... [More]