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copied!<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<GroupDropListItem> data, string SelectedValue, object htmlAttributes) { if (data == null && helper.ViewData != null) data = helper.ViewData.Eval(name) as IEnumerable<GroupDropListItem>; 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 && 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<OptionItem> Items { get; set; } } public class OptionItem { public string Text { get; set; } public string Value { get; set; } } } </code></pre>

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