Html.BeginForm

Rendering form tag is also easy and does not require any extra work.

@using (Html.BeginForm("Index", "Home", new { tenant = "mycompany" }, FormMethod.Post))
{
}

If your host is http://mycompany.localhost:54575 will render

<form url="/" type="post">
</form>

when current host is different it will render

<form url="http://mycompany.localhost:54547" type="post">
</form>