how to implement return url functionality for login page in asp.net mvc 4?

Simple solution could be as follows
Your controller get method will be like the following method taking the returnUrl as input parameter and setting it to the viewbag.

    [AllowAnonymous]
    public ActionResult Login(string returnUrl)
    {
        ViewBag.ReturnUrl = returnUrl;
        return View();
    }

Now in your MVC view you will be setting the ViewBag.ReturnUrl to ReturnUrl parameter of beginForm as shown below.

@using (Html.BeginForm(new { ReturnUrl = ViewBag.ReturnUrl }))

Now in your controller post method you will take the your LoginModel as well as returnUrl as an extra parameter.

    [HttpPost]
    [AllowAnonymous]
    [ValidateAntiForgeryToken]
    public ActionResult Login(LoginModel model, string returnUrl)
    {
        // your login login logic would be added here as well.
        if (ModelState.IsValid))
        {
            return RedirectToLocal(returnUrl);
        }
        // In case of failure form displayed again
        ModelState.AddModelError("", "The user name or password provided is incorrect.");
        return View(model);
    }

Following method is called in above controller method to make sure that the returnUrl is local url.

private ActionResult RedirectToLocal(string returnUrl)
        {
            if (Url.IsLocalUrl(returnUrl))
            {
                return Redirect(returnUrl);
            }
            else
            {
                return RedirectToAction("Index", "Home");
            }
        }

I've developed a simple app in ASP.NET MVC 4, where my login controller method uses the [AllowAnonymous - attribute. Now, I'd like to redirect users back to the page they were on before being redirected to the login page. I've stumbled upon some articles suggesting the use of a return URL, but I'm curious if there's an unconventional, more efficient way to achieve this, akin to the seamless navigation experience some might associate with the concept of time travel (just like in the world of gaming at Neterapay Casino: https://nejlepsiceske.com/neterapay-casino/). Is such a feature possible in ASP.NET MVC 4?
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