Unfortunately referencing MVC 3 futures necessitates taking an dependency on MVC 3 in your model layer, which may be unadvisable in a multi-tiered project. Nitpickers CornerĪSP.NET MVC 3 futures defines four new data annotations attributes which this project has as well: CreditCard, Email, Url and EqualTo. That’s all you need to do to start a new project and include Data Annotations Extensions, and of course you can integrate it into an existing project just as easily. The validation is also checked on the server, which is a good practice since client validation is easily bypassed.
Now let’s re-run our form and try to use some invalid values:Īll of the validation errors you see above occurred on the client, without ever even hitting submit. Let’s say you had the following “Customer” domain model (or view model, depending on your project structure) in an MVC 3 project: There is also an easily pluggable client-side validation library which can be used in ASP.NET MVC 3 projects using unobtrusive jquery validation (only MVC3 included javascript files are required). The core library provides server-side validation attributes that can be used in any. You can find a current list of the validation attributes on the afore mentioned website. The Data Annotations Extensions project can be found at, and currently provides 11 additional validation attributes (ex: Email, EqualTo, Min/Max) on top of Data Annotations’ original 4. A Quick Word About Data Annotations Extensions The Data Annotations Extensions project attempts to augment these validators with additional attributes while maintaining the clean integration Data Annotations provides.
Data Annotations Validation is becoming more popular and is being baked in to many other Microsoft offerings, including Entity Framework, though with MVC it only contains four validators: Range, Required, StringLength and Regular Expression.
Out of the box MVC comes with support for Data Annotations (that is, ) and can be extended to support other frameworks. The recent release of ASP.NET MVC 3 has improved these offerings on the client side by introducing an unobtrusive validation library built on top of jquery.validation. Validation of user input is integral to building a modern web application, and ASP.NET MVC offers us a way to enforce business rules on both the client and server using Model Validation.
ASP.NET ASP.NET MVC Code Data Annotations jQuery MVC Tips Validation Visual Studio