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This helper is used to display an error message right next to a form field. Validation Message() helper displays an asterisk when there is an error.The page in Figure 3 illustrates the error messages rendered by the validation helpers when the form is submitted with missing fields and invalid values. Validate(Document Validation Handler); Xml Reader Settings settings = new Xml Reader Settings(); settings.

You learn how to use model state and the validation HTML helpers.

You use model state - or more accurately, the model state dictionary - to represent validation errors. Add Model Error("Description", "Description is required."); if (product To Create.

For example, the Create() action in Listing 1 validates the properties of a Product class before adding the Product class to a database. Units In Stock In Listing 1, the Name, Description, and Units In Stock properties of the Product class are validated.

Figure 04: Prebinding Validation Errors(Click to view full-size image) There are actually two types of validation error messages - those generated before the HTML form fields are bound to a class and those generated after the form fields are bound to the class.

In other words, there are prebinding validation errors and postbinding validation errors.

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If you submit the HTML form for creating a Product, and you enter an invalid value for the price field and no value for the Units In Stock field, then you'll get the validation messages displayed in Figure 4.

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