asp.net - HTML.DropDownList values from multiple sources? -

in asp.net mvc, possible fill list of values of html.dropdownlist multiple data sources along multiple manually entered values?

basically, envision being formated below using along lines of optgroup:

**group 1**   manual item 1 manual item 2 **group 2** ds1 item 1 ds1 item 2 **group 3** ds2 item 1 ds2 item 2 

i've thought using view on db , getting data that, however, i've not faintest how lay out above using helpers , pass data multiple sources.

thanks in advance.

as start model (actually start unit test no time here):

public class mymodel {     public string selecteditem { get; set; }     public ienumerable<selectlistitem> items { get; set; } } 

then controller:

public class homecontroller : controller {     public actionresult index()     {         var items1 = new[]          {               new { value = "1", text = "manual item 1" },             new { value = "2", text = "manual item 2" },         };          // todo: go fetch repo1         var items2 = new[]          {               new { value = "3", text = "ds1 item 1" },             new { value = "4", text = "ds1 item 2" },         };          // todo: go fetch repo2         var items3 = new[]          {               new { value = "5", text = "ds2 item 1" },             new { value = "6", text = "ds2 item 2" },         };          var items = items1.concat(items2).concat(items3);         var model = new mymodel         {             items = new selectlist(items, "value", "text")         };         return view(model);     } } 

and typed view model:

<%@ page language="c#" masterpagefile="~/views/shared/site.master" inherits="system.web.mvc.viewpage<myapp.models.mymodel>" %> <asp:content id="content2" contentplaceholderid="maincontent" runat="server">     <%= html.dropdownlistfor(x => x.selecteditem, model.items) %> </asp:content> 

you define intermediary type avoid anonymous types i've used brevity.

remark: if original question using optgroup ignore answer , make intention clear can more adapted answer.