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I'm trying to create a simple WPF Application using data binding. The code seems fine, but my view is not updating when I'm updating my property. Here's my XAML: <Window x:Class="Calculator.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:calculator="clr-namespace:Calculator" Title="MainWindow" Height="350" Width="525" Name="MainWindowName"> <Grid> <Label Name="MyLabel" Background="LightGray" FontSize="17pt" HorizontalContentAlignment="Right" Margin="10,10,10,0" VerticalAlignment="Top" Height="40" Content="{Binding Path=CalculatorOutput, UpdateSourceTrigger=PropertyChanged}"/> </Grid> </Window> Here's my code-behind: namespace Calculator { public partial class MainWindow { public MainWindow() { DataContext = new CalculatorViewModel(); InitializeComponent(); } } } Here's my view-model namespace Calculator { public class CalculatorViewModel : INotifyPropertyChanged { private String _calculatorOutput; private String CalculatorOutput { set { _calculatorOutput = value; NotifyPropertyChanged(); } } public event PropertyChangedEventHandler PropertyChanged; protected virtual void NotifyPropertyChanged([CallerMemberName] String propertyName = "") { var handler = PropertyChanged; if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName)); } } } I'm can't see what I am missing here?? o.O

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