Validating required fields dating engaged long

NET, you could very well use the concept of Data triggers in WPF.One of the key benefits triggers offer is that they can be effectively managed within the XAML without usually requiring much of procedural code.So if you have a need of say Text Box controls that should not be empty and should contain some value, you can create a Style with a Data trigger that fires when the Text Box's Text field is empty.

Be careful that you aren't too restrictive though, which might lead to false negatives and a poor user experience.Also since triggers are raised on specific actions/events, they are automatically undone when the action/event is over.This comes handy and saves code, since otherwise in procedural code, you need to handle both cases (something that is seen in my work with extension methods).However, I prefer to call it explicitly and handle all validation at once since you most likely will take action only if the entire control’s children pass validation. The most important thing to recognize here is how precise you can be with the validation error message in the error provider.There are 2 code paths for validation failure, and in each case we provide the user with an appropriate error message.

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