ASP.NET MVC CheckBox List sending always null

Question

I want to create a table with items and checkboxes to select these items. I am including these checkboxes in a list but this list is always returning null. Thank you very much for your help.

Controller:

public ActionResult Index()
{
    var expenseTypesView = new ViewExpenseTypesAndSelection
    {
        ExpensesTypes = _context.ExpenseType.ToList(), 
    };       
    return View(expenseTypesView);
}

[HttpPost]
public ActionResult SelectExpensesTypes( ViewExpenseTypesAndSelection SelectedExpenses)
{
    var entry = new userSpecificExpenses();
    var i = 0;
    foreach (var item in SelectedExpenses.SelectedExpenses)
    {
        if(item)
        {
            entry.expenseTypeId = i;
            entry.UtilisateurId= User.Identity.GetUserId();
            _context.UserspecificExpenses.Add(entry);
            _context.SaveChanges();
        }
        i++;
    }
    return View();
}

View:

@model MBT.ViewModels.ViewExpenseTypesAndSelection
....
@using (Html.BeginForm("SelectExpensesTypes", "ExpenseTypes"))
{
    <table class="table table-bordered table-hover">
        <thead>
            <tr>
                <th class="text-center">Expense</th>
                <th class="text-center">Include</th>
            </tr>
        </thead>
        <tbody>
            @{
                for (int i = 0; i < Model.ExpensesTypes.Count; i++)
                {
                    <tr>
                        <td>
                            <div class="checkbox">
                                @Model.ExpensesTypes[i].Type
                            </div>
                        </td>
                        <td>
                            <div class="checkbox">
                                @Html.CheckBoxFor(m => m.SelectedExpenses[i])
                            </div>
                        </td>
                    </tr>
                }
            }
        </tbody>
    </table>
    <button type="submit" class="btn btn-primary">Submit</button>
}

Answer 1

You sending ViewExpenseTypesAndSelection almost null just with ExpensesTypes and then post it back to your post method. It means you send null and receive null. So what is wrong with that?