Files to look at:

• MainWindow.xaml (VB: MainWindow.xaml)
• MainWindow.xaml.cs (VB: MainWindow.xaml.vb)

How to display notifications by implementing the IDataErrorInfo interface

Please implement the IDataErrorInfo interface on the data object. Then, pass the text and type of error in the IDataErrorInfo.Error property ( it is possible to easily parse this string). Implement a custom style for the ErrorControl. This element presents the error icon. Modify the ErrorControl style in such a way as to take into account a custom error type and text (use the converter).

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