How to update a ListBox (WPF) on demand?

Question

WPF

Hello!
There is a ListBox which is filled with the data from a DB. Further, if the record was edited in the application, this list must be updated (rebuild it). How to implement it?
Now I'm building a list in a very "simple" way:

var lines = new List<NewsList>();

// Заполняем
// lines.Add

myListBox.DataContext = lines;

I understand that this is the easiest option, which is not ready for any update. And how would it be more competent to implement the same list, but only called (formed) on demand? For example, the first time when the application is initialized, the second time after submitting the form.

Answer 1

First, it's better to use an ItemsSource rather than a DataContext. And secondly, instead of List, take ObservableCollection.

Answer 2

+ to what Maxim Vanyushkin wrote Maxim Vanyushkin :D
To catch changes in the objects themselves inside the collection, you need to use BindingList .
And learn WPF MVVM, spend a couple of hours.
Developing Using the Design Pattern...

Answer 3

+ to what Aleksey Pavlov wrote :
If an already existing record is being edited, then the record object must implement INotifyPropertyChanged, then changing this object in any part of the program will cause it to be updated in all places of the UI where it is shown.