using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace Users
{
    class User
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        [Range(1, 2147483647)]
        public int Id { get; set; }
        [Required]
        [StringLength(30,MinimumLength = 4, ErrorMessage = "Username must be between 4 and 30 simbols")]
        public string Username { get; set; }
        [Required]
        [RegularExpression(@"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[^\da-zA-Z]).{6,50}$)]", ErrorMessage = "Error password validation")]
        public string Password { get; set; }
        [Required]
        [RegularExpression(@"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$", ErrorMessage = "Error Email validation")]
        public string Email { get; set; }
        [StringLength(1048576)]
        public string ProfilePicture { get; set; }
        public DateTime RegisteredOn { get; set; }
        public DateTime LastTimeLoggedIn { get; set; }
        [Range(1, 120)]
        public byte Age { get; set; }
        public bool IsDeleted { get; set; }
    }
}

//StartUp класа
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Users
{
    class StartUp
    {
        static void Main(string[] args)
        {
            User user = new User()
            {
                Username = "Stewart",
                Password = "YZK93CHX2QX",
                Email = "Nam@acnulla.co.uk",
                RegisteredOn = new DateTime(11 / 19 / 2001),
                LastTimeLoggedIn = new DateTime(02 / 12 / 2015),
                Age = 18,
                IsDeleted = false
            };
            Console.WriteLine("{0} {1} {2} {3} {4} {5} {6}",
                user.Username, user.Password, user.Email, user.RegisteredOn,
                user.LastTimeLoggedIn, user.Age, user.IsDeleted);
        }
    }
}