How to dynamically create a tree view in asp.net?

I have 2 database tables named Categories and SubCategories and I want to create an Unordered List inside my asp.net web form like a开发者_JS百科 tree view like

ul li a href=""CategoryDynamicData/li ul li SubCategoryDynamicData li .. .. ..

Any algorithms for that ? I couldn't nest 2 repeaters ?

Out of curiosity, why won't asp:TreeView work for you?

You could use a jQuery plugin, like the Treeview plugin. It works exactly as you described, by using ul and li to represent the tree branches and leaves.

OK It seems not the best way but here how I solved this... Hope it helps others :)

    protected void Page_Load(object sender, EventArgs e)
    {
        StringBuilder sb = new StringBuilder();
        using (ProjectsDataContext dc = new ProjectsDataContext())
        {
            var categories = from cats in dc.Categories
                             select cats;

            sb.Append("<ul id=\"sitemap\" class=\"sitemap\">");

            foreach (Category c in categories)
            {
                sb.Append("<li><a href=\"ShowCategory.aspx?CategoryID="+c.CategoryID +"\">"+ c.Name+"</a>");

                var subcategories = from subs in dc.SubCategories
                                    where (subs.Category.Name == c.Name)
                                    select subs;

                sb.Append("<ul>");

                foreach (SubCategory s in subcategories)
                {
                    sb.Append("<li><a href=\"../ShowSubCategory.aspx?SubCategoryID=" + s.SubCategoryID + "\">" + s.Name + "</a></li>");
                }
                sb.Append("</ul></li>");

            }

            sb.Append("</ul>");
        }


        lala.Text = sb.ToString();
    }

you can display Hierarchical Data with TreeView. See following sample to bind data in treeview:
http://urenjoy.blogspot.com/2009/08/display-hierarchical-data-with-treeview.html