aspnetcore/samples/1.0.0-beta8/HelloMvc/Models/User.cs

using System.ComponentModel.DataAnnotations;

namespace MvcSample.Web.Models
{
    public class User
    {
        [Required]
        [MinLength(4)]
        public string Name { get; set; }
        public string Address { get; set; }
        public int Age { get; set; }
    }
}