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The goal of this tutorial was to describe the basic mechanics of validation in the ASP. You learned how to use model state and the validation HTML helpers.We also discussed the distinction between prebinding and postbinding validation.In other tutorials, we'll discuss various strategies for moving your validation code out of your controllers and into your model classes.Note The feedback system for this content will be changing soon. If content within a comment thread is important to you, please save a copy.

In other words, there are prebinding validation errors and postbinding validation errors.This is useful when you have a field that cannot be validated on the client and is therefore likely to fail validation when the form is submitted.For example, many Web sites require you to register using a unique user ID.The Create() action exposed by the Product controller in Listing 1 accepts an instance of the Product class.The signature of the Create method looks like this: The values of the HTML form fields from the Create form are bound to the product To Create class by something called a model binder.

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