请教一个SqlDataSource的问题

<dxwgv:ASPxGridView ID="ASPxGridView1" runat="server" 
           AutoGenerateColumns="False" DataSourceID="SqlDataSource1" 
           KeyFieldName="ntypeid" onload="ASPxGridView1_Load" Width="100%">
           <Templates>
               <DetailRow>
                   <dxwgv:ASPxGridView ID="ASPxGridView2" runat="server" 
                       AutoGenerateColumns="False" DataSourceID="SqlDataSource2" 
                       KeyFieldName="ntypeid" 
                       onbeforeperformdataselect="ASPxGridView2_BeforePerformDataSelect" 
                       Width="500px">
                       <Columns>
                           <dxwgv:GridViewDataTextColumn FieldName="ntypeid" VisibleIndex="0" 
                               Visible="False">
                               <PropertiesTextEdit DisplayFormatString="{0}">
                               </PropertiesTextEdit>
                           </dxwgv:GridViewDataTextColumn>
                           <dxwgv:GridViewDataTextColumn FieldName="title" 
                               VisibleIndex="0" Caption="产品名称" Width="100px">
                               <PropertiesTextEdit DisplayFormatString="{0}">
                               </PropertiesTextEdit>
                           </dxwgv:GridViewDataTextColumn>
                           <dxwgv:GridViewDataTextColumn Caption="产品简介" FieldName="note" VisibleIndex="1" 
                               Width="400px">
                           </dxwgv:GridViewDataTextColumn>
                           <dxwgv:GridViewDataHyperLinkColumn Caption="详细" FieldName="pdid" 
                               VisibleIndex="2" Width="50px">
                               <PropertiesHyperLinkEdit NavigateUrlFormatString="show.aspx?id={0}" Text="详细..">
                               </PropertiesHyperLinkEdit>
                               <CellStyle HorizontalAlign="Left">
                               </CellStyle>
                           </dxwgv:GridViewDataHyperLinkColumn>
                       </Columns>
                   </dxwgv:ASPxGridView>
               </DetailRow>
               <DataRow>
                   <table border="0" cellpadding="0" cellspacing="0" height="105" 
                       style="margin-left:10px; margin-top:10px;" width="420">
                       <tr valign="middle">
                           <td style="color:blue; height:35px">  
                               <%# DataBinder.Eval(Container.DataItem,"series") %></td>
                           <td rowspan="2" width="105">
                               <asp:Image ID="Image1" runat="server" Height="105px" Width="105px" 
                                   ImageUrl='<%# Eval("pic") %>' />
                           </td>
                       </tr>
                       <tr valign="top">
                           <td style="height:70px">
                               <%# DataBinder.Eval(Container.DataItem,"Note") %></td>
                       </tr>
                   </table>
               </DataRow>
           </Templates>
           <SettingsPager PageSize="6">
           </SettingsPager>
           <Border BorderStyle="None" />
           <Columns>
               <dxwgv:GridViewDataTextColumn FieldName="ntypeid" ReadOnly="True" 
                   Visible="False" VisibleIndex="0">
                   <EditFormSettings Visible="False" />
               </dxwgv:GridViewDataTextColumn>
               <dxwgv:GridViewDataTextColumn Caption="系列名称" FieldName="series" 
                   VisibleIndex="0">
               </dxwgv:GridViewDataTextColumn>
               <dxwgv:GridViewDataTextColumn Caption="产品介绍" FieldName="note" VisibleIndex="1">
               </dxwgv:GridViewDataTextColumn>
               <dxwgv:GridViewDataImageColumn Caption="缩略图" FieldName="pic" VisibleIndex="2" 
                   Width="105px">
                   <PropertiesImage ImageHeight="105px" ImageWidth="105px">
                   </PropertiesImage>
               </dxwgv:GridViewDataImageColumn>
               <dxwgv:GridViewDataTextColumn Caption="类别编号" FieldName="typeid" Visible="False" 
                   VisibleIndex="3">
               </dxwgv:GridViewDataTextColumn>
           </Columns>
           <Settings ShowColumnHeaders="False" />
           <SettingsDetail ShowDetailRow="True" AllowOnlyOneMasterRowExpanded="True" />
       </dxwgv:ASPxGridView>
       <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
           ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 
           SelectCommand="SELECT [ntypeid], [series], [pic], [note], [typeid] FROM [series] WHERE ([typeid] = @typeid)">
           <SelectParameters>
               <asp:QueryStringParameter DefaultValue="1" Name="typeid" 
                   QueryStringField="typeid" Type="Int32" />
           </SelectParameters>
       </asp:SqlDataSource>
       <asp:SqlDataSource ID="SqlDataSource2" runat="server" 
           ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 
           SelectCommand="SELECT [ntypeid], [title], [note],[pdid] FROM [product] WHERE ([ntypeid] = @ntypeid)">
           <SelectParameters>
               <asp:SessionParameter Name="ntypeid" SessionField="ntypeid" Type="Int32" />
           </SelectParameters>
       </asp:SqlDataSource>现在的问题是我需要DefaultValue="1"中“”的值通过后台的
int typeid = int.Parse(Request["id"].ToString());来确定
谁可以给我点帮助
使用2个SqlDataSource是要做一种特别的效果 所以希望高手们就不要让我写到后台去了
否则又要麻烦不少了