asp.net mvc : create listbox using formcollection

I'm experiencing current error in my view:

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master"  Inherits="System.Web.Mvc.ViewPage<ProjectenII.Models.Domain.StudentModel>"%>

<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
    IndexStudents开发者_运维知识库
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    <h2>IndexStudents</h2>

  <%using (Html.BeginForm()) { %>
    <%=Html.ListBoxFor(model => model.NormalSelected, new MultiSelectList(Model.NormalStudentsList, "StudentNummer", "Naam", Model.NormalSelected), new { size = "6" }); %>

    <input type="submit" name="add" 
                          id="add" value=">>" /><br />
    <input type="submit" name="remove" 
                          id="remove" value="<<" />
    <%=Html.ListBoxFor(model => model.NoClassSelected, new MultiSelectList(Model.StudentsNoClassList, "StudentNummer", "Naam", Model.NoClassSelected)); %>
  <% } %>

  <%=Html.HiddenFor(model => model.Save) %>
  <input type="submit" name="apply" id="apply" value="Save!" />
</asp:Content>

It gives me an error at the listboxfor() method... saying ") expected".

But I close all the opening tags... very strange though! What I want to use it for: I want to move items from one listbox to the other and then update the database. So I'd like to do it using formCollection, unless there is another way?

Students have a field named "classID", when I update the database, that value needs to change from the current value to "0". I think the best way is using formCollections? Isn't it? This is my StudentModel

   public class StudentModel
    {
        public IEnumerable<Student> NormalStudentsList { get; set; }
        public IEnumerable<Student> StudentsNoClassList { get; set; }
        public string[] NormalSelected { get; set; }
        public string[] NoClassSelected { get; set; }
        public string Save { get; set; }
    }

Controller:

 public ActionResult IndexStudents(Docent docent, int id, int klasgroepid)
        {
            var studentModel = new StudentModel
            {
               NormalStudentsList = docent.GeefStudenten(id, klasgroepid),
               StudentsNoClassList = docent.GeefStudenten(id, klasgroepid)
            };

            return View(studentModel);
        }

I have two questions: how can I fix the error? AND how can I update the database?

I suggest using "UpdateModel()" ... ?

Thanks in advance!!

Not sure what your second question is because you didn't include the code you're using to persist your model to the database.

The ")" expected error is because you have a semicolon at the end of your ListBoxFor method call.

It should look like this:

<%=Html.ListBoxFor(model => model.NormalSelected, new MultiSelectList(Model.NormalStudentsList, "StudentNummer", "Naam", Model.NormalSelected), new { size = "6" }) %>

When you use <%= you don't need the semicolon.