Data Annotation Value not getting implemented

Hi

   I have below Index View 

@using (Html.BeginForm("CreateEdit", "Customer", FormMethod.Post))
        {
            @Html.AntiForgeryToken()
           
           

******************************** JAVASCRIPT 

$('body').on('click', '[id*=btnEdit]', function () {
        hfAU = "U";
        var data = $(this).parents('tr').find('td');
        var Id = data.eq(0).html();
        $('#hfId').val(Id);
        var url = "/Customer/CreateEdit?Id=" + Id;
        $("#myModalBody").load(url, function () {
            $(".modal-title").html("Update");
            $("#myModal").modal("show");
        });
    });

********************************************* DATA ANNOTATION

    public class Customer
    {
        //private string _isactive = "Y";
        public Customer()
        {
            CreatedOn = DateTime.Now;
            //LastUpdatedOn = DateTime.Now;
        }

        [Key]
        [Required(ErrorMessage = "Id cannot be Blank. Max length should be less than or equal to 20."), MaxLength(20)]
        //[RegularExpression(@"^[ a-zA-Z\s]$", ErrorMessage = "Special Characters not allowed")]
        [Display(Name = "Id")]
        [Remote("IsExist", "Customer", ErrorMessage = "Id already exists")]
        public string Id { get; set; }

        [Display(Name = "Description")]
        [DataType(DataType.Text)]
        [Required(ErrorMessage = "Customer Name cannot be Blank. Max length should be less than or equal to 50"), MaxLength(50)]
        public string Description { get; set; }

        [Display(Name = "Active")]
        public bool IsActive { get; set; }

        [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}")]
        public DateTime CreatedOn { get; set; }

    }