asp.net mvc : create listbox using formcollection - asp.net

Question

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
</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!!

Answer 1

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.