Validation Error not being displayed (MVC4 and EF) - asp.net-mvc

Question

The invalid login error message is not being displayed for incorrect username or password. I have a Model called User and a Controller with the Action Method Validate, which validates the username and password. Upon successful validation I redirect to Create Action method, if not I add a model error and I want to display an "Invalid username or password" message on the login screen.
Model:
public class User
{
public int ID { get; set; }
[Required]
[Display(Name="User Name")]
public string UserName { get; set; }
[Required]
[DataType(DataType.Password)]
public string Password { get; set; }
[Required]
[Display(Name="First Name")]
public string FirstName { get; set; }
[Required]
[Display(Name="Last Name")]
public string LastName { get; set; }
[Required]
[DataType(DataType.PhoneNumber)]
[MinLength(10)]
[MaxLength(10)]
[Display(Name="Mobile No")]
public string PhoneNum { get; set; }
}
Controller:
[HttpGet]
public ActionResult Validate()
{
return View();
}
[HttpPost]
[AllowAnonymous]
[ValidateAntiForgeryToken]
public ActionResult Validate(User user)
{
var u1 = db.Users.Where(p => p.UserName == user.UserName && p.Password == user.Password).FirstOrDefault();
if (u1 != null)
{
return RedirectToAction("Create");
}
else
{
ModelState.AddModelError("", "The user name or password provided is incorrect.");
}
return RedirectToAction("Validate");
}
View:
#model HindiMovie.Models.User
#{ViewBag.Title = "Login";}
<h2>Login</h2>
#using (Html.BeginForm()) {
#Html.AntiForgeryToken()
#Html.ValidationSummary(false,"The user name or password provided is incorrect.")
<fieldset>
<legend>User</legend>
<div class="editor-label">
#Html.LabelFor(model => model.UserName)
</div>
<div class="editor-field">
#Html.TextBoxFor(model => model.UserName)
#Html.ValidationMessageFor(model => model.UserName)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.Password)
</div>
<div class="editor-field">
#Html.PasswordFor(model => model.Password)
#Html.ValidationMessageFor(model => model.Password)
</div>
<p>
<input type="submit" value="Validate" />
</p>
</fieldset>
}
<div>
#Html.ActionLink("Back to List", "Index")
</div>
#section Scripts {
#Scripts.Render("~/bundles/jqueryval")
}

Answer 1

Redirecting resets the ModelState. You probably want to re-display the view instead:
public ActionResult Validate(User user)
{
var u1 = db.Users.Where(p => p.UserName == user.UserName && p.Password == user.Password).FirstOrDefault();
if (u1 != null)
{
return RedirectToAction("Create");
}
ModelState.AddModelError("", "The user name or password provided is incorrect.");
return View();
}