<system.web>
        <authentication mode="Forms">
            <forms loginUrl="~/Home/Login" timeout="30" />
        </authentication>
</system.web>

public ActionResult LoginUser(string username, string password)
    {
        if (ConfigurationManager.AppSettings["UserName"] == username && ConfigurationManager.AppSettings["Password"] == password)
        {
            FormsAuthentication.SetAuthCookie(username, false);

            return RedirectToAction("Index");
        }
        return RedirectToAction("Index");
    }

$("body").on("click", "#loginbutton", function (e) {

$("#loginbutton").attr("href", "/loginuser?username=" + $('[user]').attr('user') + "&password=" + $('[pass]').attr('pass'));

});