why textbox is appear when fillup the correct details?

Hi Frnds

i am working on client side validation in mvc4..

i worked with this and this code is working fine..

now i added 1 textbox at runtime for ,if i entered the wrong details then textbox should be generated..

this thing also done...means if i entered the wrong details textbox is diaplayong...this is correct..

after that if i fillup the correct details and click on submit button textbox should not be display..

this thing also did..

but i am confused if i click on submit button textbox should not be appear but it is appear then gone..

this is my code///

model///

public class Employee
    {
       //[Required(ErrorMessage = "Name is Required")]
      [Required]
        [Display(Name = "Name")]

[RegularExpression(@"^.{6,10}$", ErrorMessage = "Name should be of minimum 6 and maximum 10 characters")]

public string Name { get; set; }

        [Required(ErrorMessage = "Email is Required")]
        [Display(Name = "Email")]
        [RegularExpression(@"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" + @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" + @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$",
          ErrorMessage = "Email is not valid")]

        public string Email { get; set; }

        [Required(ErrorMessage = "Password is Required")]
        [Display(Name = "Password")]
        [RegularExpression(@"^(?=.*\d)(?=.*[a-zA-Z]).{4,8}$", ErrorMessage = "Password Should be contain atleast 1 Upper, 1 Lower and 1 number")]

        //Password Should be contain atleast 1 Upper, 1 Lower and 1 Special Character
        public string Password { get; set; }
    }

View//

@model ClientSideValidation.Models.Employee

@{
ViewBag.Title = "Employee Registration Form";
}

@if (ViewData.ModelState.IsValid)
{
    if (@ViewBag.Name != null)
    {


                Name : @ViewBag.Name

                Email : @ViewBag.Email



    }
}

@using (Html.BeginForm())
{
@Html.ValidationSummary(true)

Employee

@Html.LabelFor(model => model.Name)

                @Html.EditorFor(model => model.Name)
                @Html.ValidationMessageFor(model => model.Name, "", new { @Style = "color:red" })

@Html.LabelFor(model => model.Email)

                @Html.EditorFor(model => model.Email)
                @Html.ValidationMessageFor(model => model.Email, "", new { @Style = "color:red" })

@Html.LabelFor(model => model.Password)

                @Html.EditorFor(model => model.Password, new { maxlength = 20, value = ViewBag.Selpwd })
                @Html.ValidationMessageFor(model => model.Password, "", new { @Style = "color:red" })

}

@section Scripts {
@Scripts.Render("~/bundles/jqueryval")

}

controller//

public class EmployeeRegFormController : Controller
    {
        // GET: EmployeeRegForm
        public ActionResult Index()
        {
            return View();
        }

        [AcceptVerbs(HttpVerbs.Post)]
        public ActionResult Index(Employee model)
        {
            if (ModelState.IsValid)
            {
                ViewBag.Name = model.Name;
                ViewBag.Email = model.Email;
                ViewBag.Password = model.Password;
            }
           if(model.Name == null)
            {
                ModelState.AddModelError("", "Details is incorrect!");
            }
            return View(model);
       }
    }