Instead, the source was updated only after focus was lost on the Text Box.The third and last Text Box uses the Property Changed value, which means that the source value will be updated each time the bound property changes, which it does in this case as soon as the text changes.The following example will show you why we need these two things: Try running it for yourself and watch how even though you add something to the list or change the name of one of the users, nothing in the UI is updated.The example is pretty simple, with a User class that will keep the name of the user, a List Box to show them in and some buttons to manipulate both the list and its contents.This will make the Add and Delete button work, but it won't do anything for the "Change name" button, because the change will happen on the bound data object itself and not the source list - the second step will handle that scenario though.The second step is to let our custom User class implement the INotify Property Changed interface.This behavior is controlled by a property on the binding called Update Source Trigger.In the Code-behind, you will find the Click handler, where we use a couple of lines of code to get the binding from the destination control and then call the Update Source method on it.
So far in this tutorial, we have mostly created bindings between UI elements and existing classes, but in real life applications, you will obviously be binding to your own data objects.
The Items Source of the list is assigned to a quick list of a couple of users that we create in the window constructor.
The problem is that none of the buttons seems to work. The first step is to get the UI to respond to changes in the list source (Items Source), like when we add or delete a user.
Just valour sure that you don't exploration the source value more often than you together need to.
Elsewhere, the site ;roperty updated only after upsating was lost on the Text Box.