WPF DataBinding not updating?

Question

I have a project, where I bind a checkbox\'s IsChecked property with a get/set in the codebehind. However, when the application loads, it doesn\'t update, for some reason. I

Answer 1

In order to support data binding, your data object must implement INotifyPropertyChanged

Also, it's always a good idea to Separate Data from Presentation

public class ViewModel: INotifyPropertyChanged
{
    private bool _test;
    public bool Test
    {  get { return _test; }
       set
       {
           _test = value;
           NotifyPropertyChanged("Test");
       }
    }

    public PropertyChangedEventHandler PropertyChanged;

    public void NotifyPropertyChanged(string propertyName)
    {
         if (PropertyChanged != null)
             PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}

<Window x:Class="TheTestingProject_WPF_.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
<Grid>
    <Viewbox>
        <CheckBox IsChecked="{Binding Path=Test, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
    </Viewbox>
</Grid>

Code Behind:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = new ViewModel{Test = true};
    }
}