post data listbox with form submit in mvc3

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ListBox

hi,friends;
I am new in mvc3. and i want to get data of listbox to controller when form is post. i have get form data with team.cs file and create property public List<int> availableteam { get; set; } for geting listbox data but it is display null value. and i have been used

<%: Html.ListBoxFor(Model => Model.availableteam ,  new SelectList(Enumerable.Empty<SelectListItem>(), "user_id", "user_login_name"),
                               new { id = "ddlModels1" }) %>

on view
how can i get value?

Thank you.