ObservableCollection implements INotifyPropertyChanged. This interface exposes events that allow consumers of your collection to be notified when the contents of the collection change. This is mainly used when binding in WPF, for example let’s say we have an ObservableCollection<string>: ObservableCollection<string> MyStrings { get { // return a collection with some strings here } } and … Read more
Rather than using SelectedIndex, have you tried using SelectedItem or SelectedValue? If the DataGrid‘s ItemSource is set to your ObservableCollection, then those properties should point directly to the selected contained object. solved Accessing items in ObservableCollection bound to WPF DataGrid
It sounds like you haven’t assigned your DataContext. Below is a brief example. Assuming your custom class looks something like this: CODE: public class Foo { private ObservableCollection<string> _names; public ObservableCollection<string> Names { get{ return _names;} set { _names = value; } } } and your XAML looks like XAML: <ListBox Name=”lstNames” ItemsSource=”{Binding Names}”/> Set … Read more