How to Implement Remote Validation in ASP.Net MVC

Introduction

For some of our web applications we must validate the uniqueness of a field, for example when we create a user for the application then the user Id must be unique in order to provide login capability for the system. To do this we need to write code to make a remote server call to validate the field.

ASP.NET MVC provides a mechanism that can make a remote server call to validate the field without posting the entire form to the server. The "Remote" validation attribute is useful for that. This attribute is useful when we have a field that cannot be validated on the client side so we must validate it on to the server side.

Remote Attribute

The Remote attribute class uses the jQuery validation plug-in remote validator. With remote attribute, we need to pass a route name (to validate the text on the server side) or pass an action and controller name. This attribute enables a client-side validation and makes a call to the server when the actual validation is done.

For example, I want to create a customer registration form and it has a user id that must be unique within the database. I want to validate this user id using a remote attribute. The Following is the procedure to use a remote attribute in this case.


Step 1

Create a model for the customer and apply the report validation for the column user id.