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copied!<p>Hi there I believe you are going around this the correct way you just need to go a step further. Here are how would expect the classes to look:</p> <p>Chip</p> <pre><code>public class Chip : INotifyPropertyChanged { private int numberPerPlayer; public int NumberPerPlayer { get { return numberPerPlayer; } set { if (numberPerPlayer != value) { numberPerPlayer = value; OnPropertyChanged("NumberPerPlayer"); OnPropertyChanged("TotalValuePerPlayer"); } } } private decimal chipValue; public decimal ChipValue { get { return chipValue; } set { if (chipValue != value) { chipValue = value; //all columns that are based on this need to be updated OnPropertyChanged("ChipValue"); OnPropertyChanged("TotalValuePerPlayer"); } } } public decimal TotalValuePerPlayer { get { return chipValue * numberPerPlayer; } } public event PropertyChangedEventHandler PropertyChanged; public void OnPropertyChanged(string propertyName) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } } </code></pre> <p>ChipSet</p> <pre><code>public class ChipSet : INotifyPropertyChanged { public ChipSet() { foreach (var chip in Chips) { chip.PropertyChanged += (s, e) => { OnPropertyChanged("TotalTotalValuePerPlayer"); }; } } public ObservableCollection<Chip> Chips { get; set; } public decimal TotalTotalValuePerPlayer { get { return Chips.Sum(x => x.TotalValuePerPlayer); } } public void OnPropertyChanged(string propertyName) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); } } public event PropertyChangedEventHandler PropertyChanged; } </code></pre> <p>I have not tested this fully but it should point you in the right direction. Hope it helps.</p>

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