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    <p>I just write a extensions for do this, see it:</p> <hr> <pre><code>using System.Collections.Generic; using System.Linq; using System.Text; using System.Web.Routing; namespace System.Web.Mvc.Html { public static class GroupDropListExtensions { public static string GroupDropList(this HtmlHelper helper, string name, IEnumerable&lt;GroupDropListItem&gt; data, string SelectedValue, object htmlAttributes) { if (data == null &amp;&amp; helper.ViewData != null) data = helper.ViewData.Eval(name) as IEnumerable&lt;GroupDropListItem&gt;; if (data == null) return string.Empty; var select = new TagBuilder("select"); if (htmlAttributes != null) select.MergeAttributes(new RouteValueDictionary(htmlAttributes)); select.GenerateId(name); var optgroupHtml = new StringBuilder(); var groups = data.ToList(); foreach (var group in data) { var groupTag = new TagBuilder("optgroup"); groupTag.Attributes.Add("label", helper.Encode( group.Name)); var optHtml = new StringBuilder(); foreach (var item in group.Items) { var option = new TagBuilder("option"); option.Attributes.Add("value", helper.Encode(item.Value)); if (SelectedValue != null &amp;&amp; item.Value == SelectedValue) option.Attributes.Add("selected", "selected"); option.InnerHtml = helper.Encode(item.Text); optHtml.AppendLine(option.ToString(TagRenderMode.Normal)); } groupTag.InnerHtml = optHtml.ToString(); optgroupHtml.AppendLine(groupTag.ToString(TagRenderMode.Normal)); } select.InnerHtml = optgroupHtml.ToString(); return select.ToString(TagRenderMode.Normal); } } public class GroupDropListItem { public string Name { get; set; } public List&lt;OptionItem&gt; Items { get; set; } } public class OptionItem { public string Text { get; set; } public string Value { get; set; } } } </code></pre>
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    1. POSupport for optgroup in dropdownlist .NET MVC?
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    1. USlostway
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    1. COAfter formatting your code, I noticed that you have an extra `}`. Can you check that I didn't mess something up? Also, it helps readability a lot if you use spaces instead of tabs.
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    2. COlostway I'm using your extension but the selected value isn't being saved in the model.. any ideas? Thanks
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      1. USbeebul
    3. COPlease see http://stackoverflow.com/questions/4142986/optgroup-drop-down-support-in-mvc-problems-with-model-binding for a small change to your code as I couldn't get it to work... thanks.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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