mvc bind/post boolean to radiobutton

Question

I have a column in my Model with a NULLABLE boolean value. Now on my View (for editing), I would like to bind that to two radiobuttons: Yes & No. If the value is null, then

Answer 1

The use of multiple Html.RadioButtonFor (m => m.Foo, "true") seems to generate invalid HTML, because it generates controls with identical IDs:

I have solved this by making the radio buttons directly in html:

/>
       Yes


/> 
       No


/> 
       Don't Care

make sure to name the radio buttons according to the used viewmodel, eg: Model.Filter.HasImage is named: Filter.HasImage to work with model binding

The "html helper" looks like this:

    public static MvcHtmlString WriteCheckedIfTrue(this HtmlHelper htmlHelper, 
                                                   bool validation)
    {
        if(validation)
            return new MvcHtmlString("checked=\"checked\"");

        return new MvcHtmlString(string.Empty);
    }