mvc html.hidden(),asp.net mvc 2 - Why mvc Html.HiddenFor does not render my field? - Stack Overflow

To add to Manaf's correct answer--you note correctly that the problem occurs in controller actions that handle posts. I was getting the same problem in a controller action that handles a get when I explicitly pass a model to a view:

[HttpGet]

ActionResult SearchForSomething(SearchForm searchForm)

{

searchForm.MyId = SomeValueFromSession;

return View("SearchForSomething", searchForm);

}

In the view, this line that rendered a hidden input for MyId always rendered "0":

@Html.HiddenFor(m => m.MyId);

Per Darren Oster's suggestion I changed to the following and fixed the problem:

[HttpGet]

ActionResult SearchForSomething(SearchForm searchForm)

{

searchForm.MyId = SomeValueFromSession;

ModelState.Clear();

return View("SearchForSomething", searchForm);

}