prevent the logged in uuser from accesing the login page asp.net mvc applicaion

Question

Here is my controller. Its not working for logged in users preventing access to the login page. Please help me out. I have used the request.Is Authenicated and User.Identity Methods in my controller

[HttpPost]
[AllowAnonymous]
public ActionResult Login(LoginViewModel model, string returnUrl)
{
    if (Request.IsAuthenticated)
    {
        return RedirectToAction("Main","Home");
    }
   else if (!this.ModelState.IsValid)
    {
        return this.View(model);
    }

   else if (Membership.ValidateUser(model.Username, model.Password))
    {
        FormsAuthentication.SetAuthCookie(model.Username, model.RememberMe);
        if (this.Url.IsLocalUrl(returnUrl) && returnUrl.Length > 1 && returnUrl.StartsWith("/")
            && !returnUrl.StartsWith("//") && !returnUrl.StartsWith("/\\"))
        {
            return this.Redirect(returnUrl);
        }

        return this.RedirectToAction("Main", "Home");
    }
    this.ModelState.AddModelError(string.Empty,"Invalid Credentials.");
    this.ModelState.AddModelError(string.Empty, "The user name or password provided is incorrect.");

    return this.View(model);
}

Answer 1

I tried this line in my code

bool test = Request.IsAuthenticated;

and it always came up false. However I am using windows Authentication in my application. If you have a logon screen I'm assuming you are not. I found this post on the site about always receiving a false value from Request.IsAuthenticated. Obviously your code should work IF you are receiving the right value from this flag. If this is not the answer let me know I might research a little more.

Request.IsAuthenticated is always false

Answer 2

this is the way i do:

public bool IsAuthenticated
{
    get
    {
        return this._context.User != null && 
               this._context.User.Identity != null &&
               this._context.User.Identity.IsAuthenticated;
    }
}