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How to handle them may vary, depending on what you're doing and what you're looking to accomplish, but WPF comes with two very easy solutions that you can use: The Observable Collection and the INotify Property Changed interface. Items Source = users; } private void btn Add User_Click(object sender, Routed Event Args e) { users. 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. Items Source = users; } private void btn Add User_Click(object sender, Routed Event Args e) { users. The following example will show you why we need these two things: (); public Change Notification Sample() { Initialize Component(); users. Add(new User() { Name = "New user" }); } private void btn Change User_Click(object sender, Routed Event Args e) { if(lb Users. What we need is a list that notifies any destinations of changes to its content, and fortunately, WPF provides a type of list that will do just that. Data Binding { public partial class Change Notification Sample : Window { private Observable Collection(); public Change Notification Sample() { Initialize Component(); users. Add(new User() { Name = "New user" }); } private void btn Change User_Click(object sender, Routed Event Args e) { if(lb Users. As you will learn in this article, you need just a bit of extra work for this to happen, but fortunately, WPF makes this pretty easy. 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. Obviously you only have to call Notify Property Changed in the setter's of the properties that you bind to - the rest can remain the way they are.

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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. Property Changed(this, new Property Changed Event Args(prop Name)); } } } As you can see, implementing INotify Property Changed is pretty easy, but it does create a bit of extra code on your classes, and adds a bit of extra logic to your properties.This is just as easy, but once you start doing it, you might discover something that disappoints you: Changes are not automatically reflected, like they were in previous examples. Selected Item as User); } } public class User { public string Name { get; set; } } } 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. Selected Item as User); } } public class User : INotify Property Changed { private string name; public string Name { get { return this.name; } set { if(! Notify Property Changed("Name"); } } } public event Property Changed Event Handler Property Changed; public void Notify Property Changed(string prop Name) { if(this. This is the price you will have to pay if you want to bind to your own classes and have the changes reflected in the UI immediately.

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