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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.
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.