Wpf – Bind an element to two sources

Add the following values to

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Fusion
Add:
DWORD ForceLog set value to 1
DWORD LogFailures set value to 1
DWORD LogResourceBinds set value to 1
DWORD EnableLog set value to 1
String LogPath set value to folder for logs (e.g. C:\FusionLog\)

Make sure you include the backslash after the folder name and that the Folder exists.

You need to restart the program that you're running to force it to read those registry settings.

By the way, don't forget to turn off fusion logging when not needed.

If you further want the TextBoxes to update automatically when your cart class changes, your class must implement the INotifyPropertyChanged interface:

class Cart : INotifyPropertyChanged 
{
    // property changed event
    public event PropertyChangedEventHandler PropertyChanged;

    private int _subTotal;
    private int _total;
    private int _tax;

    private void OnPropertyChanged(String property)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(property));
        }
    }

    public int SubTotal
    {
        get
        {
            return _subTotal;
        }
        set
        {
            _subTotal = value;
            OnPropertyChanged("SubTotal");
        }
    }

    public int Total
    {
        get
        {
            return _total;
        }
        set
        {
            _total = value;
            OnPropertyChanged("Total");
        }
    }

    public int Tax
    {
        get
        {
            return _tax;
        }
        set
        {
            _tax = value;
            OnPropertyChanged("Tax");
        }
    }

}