WPF Validation: How to Validate the Whole Form on the Button Click

User data warrants verification in just about every application containing these forms. In all likelihood, if you have experience working with WPF application forms, you’ve had to deal with the implementation of validation in some capacity. In spite of the large amount of choices on hand, most of them are developed to function at a “field level.” As such, upon searching for “WPF validation,” you’ll learn how to use IDataErrorInfo. What if the entire form warrants validation, though?
WPF Application Example
For instance, you have an app that has authorization built into it, as well as an authorization window like this one:

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