public Registration() { InitializeComponent(); db = Database.getInstanece(); user.Username = "******"; user.Email = "Email"; Binding b = new Binding(); b.Source = user; b.Path = new PropertyPath("Username"); b.Mode = BindingMode.TwoWay; UsernameBox.SetBinding(TextBox.TextProperty, b); b = new Binding(); b.Source = user; b.Path = new PropertyPath("Email"); b.Mode = BindingMode.TwoWay; EmailBox.SetBinding(TextBox.TextProperty, b); }