RegisterModel.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Globalization;
using System.Web.Security;

namespace Auction.Web.Models
{
    using System.Web.Mvc;

    public class RegisterModel
    {
        [Key]
        [ReadOnly(true)]
        public Guid Id { get; set; }

        [ReadOnly(true)]
        [Display(Name = "Identity Provider")]
        public string IdentityProvider;

        [ReadOnly(true)]
        [Display(Name = "Name Identifier")]
        public string NameIdentifier { get; set; }

        [Required]
        [Display(Name = "Name")]
        public string Name { get; set; }

        [Required]
        [DataType(DataType.EmailAddress)]
        [Display(Name = "Email Address")]
        [RegularExpression("^([a-zA-Z0-9_\\-\\.]+)@[a-z0-9-]+(\\.[a-z0-9-]+)*(\\.[a-z]{2,3})$", ErrorMessage = "Email is not a valid e-mail address.")]
        public string Email { get; set; }

        [Required]
        [Display(Name = "Allow cookies")]
        public bool AllowCookies { get; set; }

        [ReadOnly(true)]
        public IEnumerable<ClaimModel> Claims { get; set; }
    }
}