ASP.NET MVC3 Forms Authentication

using System.ComponentModel.DataAnnotations;
using Demo.Web.ViewModels;
using System.Web.Mvc;
using Demo.Web.Utilities;

public class ChangePasswordViewModel
{
    [Required]
    [DataType(DataType.Password)]
    [Display(Name = "Current password")]
    public string OldPassword { get; set; }

    [Required]
    [ValidatePasswordLength]
    [DataType(DataType.Password)]
    [Display(Name = "New password")]
    public string NewPassword { get; set; }

    [DataType(DataType.Password)]
    [Display(Name = "Confirm new password")]
    [Compare("NewPassword", ErrorMessage = "The new password and confirmation password do not match.")]
    public string ConfirmPassword { get; set; }
}