title: how to use multiple AdditionalFields in remote validation - asp.net mvc
body: <p>I need to validate the duplicate of FirstName, LastName and Email Address combination using remote validation in my ASP.NET MVC 4 (C#) application. The Remote Validation accepts only one AdditionalFields, which is as below:</p>
  
  <pre><code> [Remote("IsUserNameAvailable", "User", AdditionalFields="LastName" )]
   public string FirstName{ get; set; }
   public string LastName{ get; set; }
   public string EmailAddress{ get; set; }
  </code></pre>
  
  <p>How can i add the EmailAddress for the combination?</p>