Is it possible to use Data Annotations for MVC in an ASP.NET WEBFORM Business Object Class?

How can I use this convention in an asp.net WEBFORM Business object class?

Example In MVC

using System.ComponenModel.DataAnnotation;

public class Customer
{
    [Required]
    [StringLength(5,20)]
    public string FirstName { get; set;}

    [Required]
    [StringLength(5,20)]
    public string LastName { get; set;}
}

I want to use this data annotation in my asp.net webform businessobject class for client validation and server validation.