Hi. I am trying to set up a member registration form in my Umbraco Cloud project, following the Creating a Member Umbraco.TV episode. I created the RegisterModel.cs file, but I am getting errors on my DataAnnotations.

The type or namespace name 'Required' could not be found (are you missing a using directive or an assembly reference?)

I am including a using statement for "System.ComponentModel.DataAnnotations", but it is grayed out, suggesting it is not being used, and the "[Required]" and "[EmailAddress]" lines are underlined.

My full code is below. What could I be doing wrong? Since this is an Umbraco Cloud project, and this Model file exists in a Class Library, do I need to add a specific reference to the Class Library project? Any suggestions would be appreciated.

using System.ComponentModel.DataAnnotations;
using System.Web.Mvc;

    namespace MyProject.Core.Models
    {
        public class RegisterModel
        {
            [Required]
            public string Name { get; set; }

            [Required]
            [EmailAddress]
            public string Email { get; set; }

            [Required]
            public string Password { get; set; }
        }
    }

Thanks,
David