ASP.NET MVC model validation breaks MVC rule?

Question

using ASP.NET MVC, I have a Model, to which I'm attaching attributes so that I can get use the MVC Model bound validation, but to doesn't this break the rule of MVC, where you are putting items that belong to the View, into the Model? I hope I don't come of as trying to be smart, I am however curious as to other's opinions.

public class Payments
{
    [DataType(DataType.Text)]
    [DisplayFormat(NullDisplayText="")]
    [Display(Name="Payment Id")]
    [Required(ErrorMessage="Required")]
    public int PaymentId { get; set; } //todo: make this into a dropdown

    [DataType(DataType.Text)]
    [Display(Name="Bill Name")]
    [Required(ErrorMessage = "Required")]
    public string PaymentName { get; set; }

    [DataType(DataType.Date)]
    [Display(Name="Date to Post Payment")]
    [Required(ErrorMessage = "Required")]
    public DateTime PaymentDate { get; set; }

    [DataType(DataType.Currency)]
    [Range(0, 922337203685477.5807)]
    [Required(ErrorMessage = "Required")]
    public double PaymentAmount { get; set; }
}

• MSDN Reference 1
• MSDN Reference 2

Answer 1

Yes. Thats why you should use ViewModels.

Answer 2

You can, but don't have to, put those validation attributes in your model.

But it's better to use a ViewModel:

public class PaymentsViewModel
{
    [DataType(DataType.Text)]
    [DisplayFormat(NullDisplayText="")]
    [Display(Name="Payment Id")]
    [Required(ErrorMessage="Required")]
    public int PaymentId { get; set; } //todo: make this into a dropdown

    [DataType(DataType.Text)]
    [Display(Name="Bill Name")]
    [Required(ErrorMessage = "Required")]
    public string PaymentName { get; set; }

    [DataType(DataType.Date)]
    [Display(Name="Date to Post Payment")]
    [Required(ErrorMessage = "Required")]
    public DateTime PaymentDate { get; set; }

    [DataType(DataType.Currency)]
    [Range(0, 922337203685477.5807)]
    [Required(ErrorMessage = "Required")]
    public double PaymentAmount { get; set; }
}

And in your View, instead of:

@model YourProject.Models.Payments

you use:

@model YourProject.Models.PaymentsViewModel

for validation.