ASP. NET MVC uses dataannotations for model validation

By adding the dataannotations of data descriptions to the model classes, we can easily add validation capabilities to the application. DataAnnotations allows us to describe the validation rules that you want to apply on model properties, and ASP. NET MVC will use these dataannotations and then return the appropriate validation information to the user.

Common dataannotations include:

1. Required must – Indicates that this property is a field that must provide content
2. DisplayName Display Name – Defines the prompt name for form fields
3. Stringlength String length – Defines the maximum length of a property of a string type
4. Range Range – provides the maximum and minimum values for a property of a numeric type
5. Bind binding – Lists the fields that are included and not included when the request parameters are bound to the model
6. Scaffoldcolumn Bracket Column-a character that needs to be hidden when editing a form
7. Compare comparison-See code for comparison with the established field values

usingSystem.Collections.Generic;usingSystem.ComponentModel.DataAnnotations;namespaceskuordermvc.models{ Public classChangePassword {[Required] [Display (Name="Email")] [EmailAddress] Public stringEmail {Get;Set; }        [Required]        [DataType (Datatype.password)] [Stringlength ( +, errormessage ="The {0} must is at least {2} characters long.", Minimumlength =6)] [Display (Name="Password")]         Public stringPassword {Get;Set; }        [DataType (Datatype.password)] [Display (Name="Confirm Password")] [Compare ("Password", errormessage ="The password and confirmation password do not match.")]         Public stringConfirmPassword {Get;Set; } }}

Of course, there are other attributes, such as regular expressions, which can be used to validate the data input format without the help of the code.

ASP. NET MVC uses dataannotations for model validation