相对于上一次的使用Relation的缺点：
1. 不能限制返回的纪录数；2. 邦定时不方便，甚至不能邦定上；3. 程序简单，但不容易理解。4. 可能对于三层以上的嵌套不容易实现。
这次给出的嵌套方案，使用的ItemDataBound事件进行嵌套，实现起来很方便，其容易理解。并且解决了以上四个问题。
以下是主要的代码：
<asp:DataList ID="DList_Class" DataKeyField="NavigatorID"
  BackColor="#ffffff"  BorderWidth="0px" CellPadding="1"
  ShowFooter="False" ShowHeader="False"  runat ="server"
  CellSpacing="20" HorizontalAlign="Justify"  RepeatColumns="2"
  RepeatDirection="Horizontal" RepeatLayout="Table" >
    <itemstyle VerticalAlign=Top></itemstyle>
    <itemtemplate>
     <b><%# DataBinder.Eval(Container.DataItem,"NavigatorID") %> @
      <%# DataBinder.Eval(Container.DataItem,"NodeCaption") %></b>
     <hr>
     <asp:DataGrid ID=DG_SubClass Width=315px Runat=server      
     AutoGenerateColumns="false"
     ShowHeader="false" ShowFooter="false" PageSize="10" AllowPaging="true"
     PagerStyle-Visible="false" BorderWidth="1" BackColor="#ffffff" BorderColor="#ffffff"
     CellPadding="0" CellSpacing="0" GridLines=Horizontal
     OnItemDataBound='DG_SubClass_ItemDataBound'>
      <ItemStyle Height="14px" BackColor="#e3f1ff"  CssClass="gridHover"></ItemStyle>
                  
      <Columns>
       <asp:BoundColumn DataField ="ModuleType" ReadOnly=True >
        <ItemStyle Width=25 HorizontalAlign=Center ></ItemStyle>
       </asp:BoundColumn>     
       
       <asp:BoundColumn DataField="NodeCaption" >
        <ItemStyle HorizontalAlign=Left CssClass="nav"></ItemStyle>
       </asp:BoundColumn>
       
       <asp:BoundColumn DataField ="ModuleType" ReadOnly=True>
        <ItemStyle Width=90 HorizontalAlign=Center></ItemStyle>
       </asp:BoundColumn>        
      </Columns>      
     </asp:DataGrid>    
    </itemtemplate>
  </asp:DataList>  

private void DList_Class_ItemDataBound(object sender, System.Web.UI.WebControls.DataListItemEventArgs e)
  {
   if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
   {
    DataGrid dg=(DataGrid)e.Item.FindControl("DG_SubClass");
    string itemIndex =this.DList_Class.DataKeys[e.Item.ItemIndex].ToString();

    string[] strSqlArray =new string[3]{"select Top 10 IOrder, ILevel, IParentID, NavigatorID, NodeCaption,ModuleID, ModuleType from  NavigatorNodes where IParentID in ( ", itemIndex, ");"};
    string strSql=string.Concat(strSqlArray);
    string TableName ="SubClass"+itemIndex;

    this.dbClass.AdapterFill(ds, CommandType.Text, strSql, TableName, new OleDbParameter[0]);

    dg.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DG_SubClass_ItemDataBound);

    dg.DataSource =ds.Tables[TableName].DefaultView;
    dg.DataBind();
   }
  }
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