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If you want to bind a view model property of a specific type to a dependency property in the view of a different type you may need to implement a custom converter class by implementing the interface and setting the Converter property of the binding to an instance of this.
In a MVVM WPF application, the view model acts as the window’s Data Context: This means that that all controls inside the window will inherit its Data Context unless some parent element of a control overrides this by setting its own Data Context property.You can do this by implementing a custom validation rule and associate this with the object at any given step, any errors that were added to the Validation.Errors attached property of the bound element during that step in a previous validation procedure are removed. Errors collection is also cleared when a valid value transfer occurs.And use error template to display your errors to user in UI.Your XAML will look like this When it comes to Di Sa Ste R's answer, I noticed a different behavior. Text shows the text in the Text Box as it was before the user entered a new character, while e.
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WPF ships with two built-in concrete implementations of the object to the Validation.