In this part, validation logic is added to the Movie model. The validation rules are enforced any time a user creates or edits a movie. Validation rules are declaratively specified in one place (in the model class), and the rules are enforced everywhere in the app.
Some Useful Links:
Input Tag Helpers: https://docs.microsoft.com/en-us/aspnet/core/mvc/views/working-with-forms?view=aspnetcore-2.1
Validation Tag Helpers: https://docs.microsoft.com/en-us/aspnet/core/mvc/views/working-with-forms?view=aspnetcore-2.1#the-validation-tag-helpers
Validation: https://docs.microsoft.com/en-us/aspnet/core/mvc/models/validation?view=aspnetcore-2.1
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