validation message for dropdownlist in MVC3

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How to keep the validation message in mvc3 if dropdownlist is formed using select and option tags.

Please find the HTML code for the dropDownlist

HTML

<select name="SwList" style="width: 150px;">
    <option>--select-- </option>
    @foreach (var Sw in Model.SwDetails)
    {
        if (SwDetails.SwId == @Sw.SwId)
        {
        <option selected="selected" value=@Sw.SwId >
            @Sw.SwName

        </option>

        }
        else
        {
        <option value=@Sw.SwId >
            @Sw.SwName
        </option>

        }
       @*  @Html.ValidationMessageFor(Sw => Sw.SwId)*@
    }
</select>

Posted 14-Sep-12 3:14am

apr1234

Updated 14-Sep-12 3:20am

fjdiewornncalwe

v3

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Dylan Morley · Answer 1 · 2012-09-14T03:23:00

Better to have a model that collects the ID of the selected item, as well as your list of possible options.

e.g. Soemthing along these lines

C#

// View model
public class MyViewModel
{
    public int SelectedValue {get; set;}

    public IEnumerable<swdetails> {get; set;}
}

// Controller
public ActionResult ShowMyView
{
    var model = new MyViewModel();
    model.SwDetails = // However you get your list of items    
}

// View
@model MyViewModel

@Html.DropDownListFor(m => m.SelectedValue, new SelectList(Model.RatingScaleOptions, "SwId", "SwName"), "[Select One]")
@Html.ValidationMessageFor(m => m.SelectedValue)</swdetails>

So, you use the 'SelectValue' to retrieve the value that is set by your user picking an item. Validation is against this field.