ASP MVC getting GET request instead of POST - asp.net-mvc

Question

I have next specific map routes
routes.MapRoute(
"MyPagePost",
"URL-Up/{name}",
new { controller = "MyController", action = "MyPostAction" },
new { httpMethod = new HttpMethodConstraint("POST") }
);
routes.MapRoute(
"MyPageGet",
"URL-Up/{name}",
new { controller = "MyController", action = "MyGetAction" },
new { name = "[A-Za-z].+", httpMethod = new HttpMethodConstraint("GET") }
);
my default controller looks like
routes.MapRoute(
name: "Default",
url: "{culture}/{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", culture = "en", id = UrlParameter.Optional },
constraints: new { culture = #"[a-zA-Z]{2}" }
);
and the issue is next:
my get MyPageGet route show a page with include FORM with POST reqvest to MyPagePost route, but on a first call I am getting the same GET request and see in URL other extra param ?culture=de. Moreover, with or without this parameter, second call it working fine via MyPagePost route.
UPDATE:
In Chrome or fiddler Logs I see that reqvest to URL-Up/Bla-Bla has 302 status and response heared is URL-Up/Bla-Bla?culture=de. Why it can't be processed ?

Answer 1

just try it with
#using(Html.BeginRouteForm("MyPagePost",FormMethod.Post))
{
<input type="submit" value="Submit"/>
}
The routes in your post working for me in both html.beginform and html.beginrouteform on the first time.
i try it with the following routes and action methods
routes.MapRoute(
"MyPagePost",
"URL-Up/{name}",
new { controller = "Home", action = "PostAction" },
new { name="[A-Za-z].+", httpMethod = new HttpMethodConstraint("POST") }
);
routes.MapRoute(
"MyPageGet",
"URL-Up/{name}",
new { controller = "Home", action = "GetAction" },
new { name = "[A-Za-z].+", httpMethod = new HttpMethodConstraint("GET") }
);
routes.MapRoute(
name: "Default",
url: "{culture}/{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", culture = "en", id = UrlParameter.Optional },
constraints: new { culture = #"[a-zA-Z]{2}" }
);
public ActionResult GetAction()
{
return View();
}
[HttpPost]
public ActionResult PostAction()
{
return View();
}