c# - Controller returns null on submit @Html.BeginForm -

i have following form:

@model proj.viewmodels.addmenu @using(html.beginform()) {  @html.antiforgerytoken() @html.textboxfor(x=>x.menu.menuname) @html.textboxfor(x=>x.menuitem.menuitemname)    <input type="submit" /> } 

and viewmodel

public class addmenu {      public menu menu { get; set; }     public menuitem menuitem { get; set; } } 

a menu can have menuitem. when submit form, expected see addmenu model have menuname completed , addmenu.menuitem.menuitemname completed.

i going add menu item menu (as menu has collection of menuitems in it).

but both menu , menuitem addmenu come null?

does know why case?

the problem you're having here you're trying bind textboxes types aren't strings, dates, integers, etc. mvc doesn't know menu , menuitem class. in these classes?

what perhaps consider create viewmodel 2 string properties, named menu , menuitem. in case you'll have populated data in postback, after can want (map other objects, etc.)

this article contains answer seems quite complete me if you're interested in reading more.