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As an exercise I decided to create a bicycle gear calculator in WPF. I created two private fields with setters that trigger OnPropertyChanged() , but I have one databound property, ratio , which behaves as "readonly", because it is dynamically calculated. When I run the program, the textboxes show, the initial values are correctly displayed, the "working" word in the property changed handler is displayed, but the ratio TextBlock doesn't update. I suspect this is due to the way the property is "getted", I wonder if it would be absolutely necessary to add a private field for every, I wonder if there should be any DependencyProperty in this... But actually I have reached my knowledge limit on this and cannot get this trivial program to work. This is my model: class SingleGearsetModel : INotifyPropertyChanged { public SingleGearsetModel() { crank = 44; cog = 16; } private int _crank; private int _cog; public int crank { get{return _crank;} set{ _crank = value; OnPropertyChanged("crank"); } } public int cog { get{return _cog;} set{ _cog = value; OnPropertyChanged("cog"); } } public double ratio { get { return (double)crank / (double)cog; } } public event PropertyChangedEventHandler PropertyChanged; protected void OnPropertyChanged(string arg) { PropertyChangedEventHandler handler = PropertyChanged; if (handler != null) { handler(this, new PropertyChangedEventArgs(arg)); Console.Writeline("working"); } } } // end class This is my XAML: <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="CalculadorFix

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