Data validation in wpf

Question

in my code i've this:

class Data
{
    private int valore;
    public int Valore
    {
        get 
        {
            return valore;
        }
        set
        {
            if (value > 10 || value < 0)
            {
                throw new ArgumentException("Insert a value between 0 and 10");
            }                    
            valore = value;                
        }
    }
}

Then i've:

Data dati = new Data { Valore = 6 };

    public MainWindow()
    {
        InitializeComponent();                      

        this.DataContext = dati;
    }

and in XAML i've:

<TextBox Height="23" Width="120" Text="{Binding Path=Valore, Mode=TwoWay, ValidatesOnExceptions=True}"

The problem is that when I insert a value greater than 10, I can't see the red border around the TextBox, but instead my application throws an un-handled exception.

Answer 1

MSDN WPF Validation

You are doing this incorrectly, the reason that your program is crashing from an unhandled exception is that you are throwing and unhandled exception.