DataList嵌套DataList

1.html代码 < HTML >      < HEAD >          < title > NestedDataLists </ title >          < meta  name ="GENERATOR"  Content ="Microsoft Visual Studio .NET 7.1" >          < meta  name ="CODE_LANGUAGE"  Content ="C#" >          < meta  name ="vs_defaultClientScript"  content ="JavaScript" >          < meta  name ="vs_targetSchema"  content ="http://singlepine.cnblogs.com/" >      </ HEAD >      < body  MS_POSITIONING ="GridLayout" >          < form  id ="Form1"  method ="post"  runat ="server" >              < asp:DataList  runat ="server"  Id ="dlCategories"  GridLines ="Both"  Bordercolor ="black"  cellpadding ="3"                 cellspacing ="0"  Headerstyle-BackColor ="#DDDDDD"  Headerstyle-Forecolor ="#777777"  Headerstyle-Font-Name ="Arial"                 Headerstyle-Font-Size ="14"  Headerstyle-Font-Bold ="true"  Font-Name ="Arial"  Font-Bold ="true"                 Font-Italic ="true"  Font-Size ="11"  ForeColor ="Red"  RepeatColumns ="1" >                  < HeaderTemplate >                     省市 & 市区                 </ HeaderTemplate >                  < ItemTemplate >                      <% # DataBinder.Eval(Container, "DataItem.province")  %>                      < br >                      < asp:DataList  runat ="server"  Id ="ChildDataList"  GridLines ="None"  Bordercolor ="black"  cellpadding ="3"  cellspacing ="0"  Headerstyle-BackColor ="#8080C0"  Headerstyle-Font-Name ="Arial"  Headerstyle-Font-Size ="8"  Font-Name ="Arial"  Font-Size ="8"  datasource ='<%#  DataBinder.Eval(Container, "DataItem.myrelation") % > ' RepeatColumns="5">                         < ItemTemplate >                                                                 <% # DataBinder.Eval(Container, "DataItem.city")  %>                          </ ItemTemplate >                      </ asp:DataList >                  </ ItemTemplate >              </ asp:DataList >          </ form >      </ body > </ HTML > 2.cs代码 public   class  NestedDataLists : System.Web.UI.Page     {        protected System.Web.UI.WebControls.DataList dlCategories;            private void Page_Load(object sender, System.EventArgs e)        {            string constring=System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];                        DataSet ds=new DataSet();            string sql1="select * from province";            SqlDataAdapter    sda1 =new SqlDataAdapter(sql1,constring);            sda1.Fill(ds,"province");            string sql2="select * from city";            SqlDataAdapter    sda2 =new SqlDataAdapter(sql2,constring);            sda2.Fill(ds,"city");                        ds.Relations.Add("myrelation", ds.Tables["province"].Columns["provinceID"], ds.Tables["city"].Columns["father"]);            dlCategories.DataSource=ds.Tables["province"].DefaultView;            dlCategories.DataBind();        }                Web Form Designer generated code#region Web Form Designer generated code        override protected void OnInit(EventArgs e)        {            //            // CODEGEN: This call is required by the ASP.NET Web Form Designer.            //            InitializeComponent();            base.OnInit(e);        }                /**//// <summary>        /// Required method for Designer support - do not modify        /// the contents of this method with the code editor.        /// </summary>        private void InitializeComponent()        {                this.Load += new System.EventHandler(this.Page_Load);        }        #endregion    }