Why does ASP.NET MVC Html.CheckBox output two INPUTs with the same name?

Question

Why in the world does the line:

<%= Html.CheckBox(\"ForSale\", Model.Product.ForSale)%> For Sale

result in the following HTML:

<

Answer 1

Here's how I've done it in one of my apps. Frustrating, but it seems to work.

public virtual ActionResult Edit(int id, FormCollection values)
{
    SomeObject dbData = _repository.GetSomeObject(id);

    try
    {
        UpdateModel(dbData);
        if (values.GetValues("CheckBoxId").Contains("true")) 
            dbData.SomeBooleanProperty = true;
        else 
            dbData.SomeBooleanProperty = false;

        _repository.Save();

        Session["Success"] = "Successfully edited the part.";
        return RedirectToAction("Index");
    }
    catch
    {
        // Handle validation errors here
        return View(new SomeObjectFormViewModel(dbData));
    }
}

Hope this helps. If you've got any follow-up questions, just leave a comment and I'll update my answer accordingly.