<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">      <Columns>          <asp:TemplateField HeaderText="费用id" >              <ItemTemplate>         <asp:Label ID="lbl01" runat="server"  Text=‘<%#Eval("rentid") %>‘></asp:Label>                  <asp:GridView ID="GridView2" runat="server" DataSource=‘<%#((System.Data.DataRowView)Container.DataItem).CreateChildView("tableRelation") %>‘ DataMember="rentid">                  </asp:GridView>              </ItemTemplate>          </asp:TemplateField>      </Columns>      </asp:GridView>

 string sql = "select rentid from lesseeRent select * from lesseeRentDetails";            System.Data.DataSet ds = SQLServerHelper.GetDataSet(System.Data.CommandType.Text, sql);            ds.Tables[0].TableName = "rent";            ds.Tables[1].TableName = "rentDetails";            DataColumn parent = ds.Tables["rent"].Columns["rentid"];            DataColumn child=ds.Tables["rentDetails"].Columns["rentid"];            DataRelation dtRelation = new DataRelation("tableRelation", parent, child, false);            ds.Relations.Add( dtRelation);            GridView1.DataSource = ds;            GridView1.DataBind();