Question

I have a C#.Net MVC3 web app. I am using Drop Down lists all over the place and having success. However, there are two that I am having trouble with. The only difference is that I am creating the SelectLists on the fly in the code rather than using Lookup tables. I use lookup tables for all the other Drop Downs. When I QuickWatch the SelectLists in the code, the correct Item has the Selected property value set to true. However, when the page loads, the item with the Selected property is not displayed. The first item is. Any ideas? This is one of those werid ones. I’ve tried both ways below. In both cases, the ViewBag.DateToYear and the SelectList DateToYear have the right values and ‘Selected’ properties set

1)

//Controller

        IList<string> dateToYear = new List<string>();
        for (int i = 0; i < numberYears; i++)
        {
            dateToYear.Add(DateTime.Now.AddYears(i).Year.ToString());
        }
        ViewBag.DateToYear = new SelectList(dateToYear,"2014")

//View

        @Html.DropDownList("DateFromYear", (SelectList)ViewBag.DateToYear )

2)
//Controller
SAME as above

//View

List<SelectListItem> DateToYear = new List<SelectListItem>();
foreach (var m in ViewBag.DateToYear)
{
    DateToYear.Add(new SelectListItem { Selected = @m.Selected, Value = @m.Text, Text = @m.Text });
} 

@Html.DropDownList("DateFromYear", DateToYear)

Answer 1

Not sure if this is the case, but I had some problem with dropdownboxes not getting selected a few days ago.

My problem was: I have a @model.Options and I created a @html.dropdownlist("Options", @model.Options, [...]). However, because they had the same name it somehow conflicted. When I used @html.dropdownlist("anythingElse", @model.Options, [...]) it worked fine.

When I QuickWatched return View(model) the selected options seemed to be set correct too, so it took a while to figure that out. Maybe you have the same problem?