[CLOSED] how to page with PageProxy

[tobros]

        <ext:GridPanel runat="server" Title="现金流量数据调整">
            <Store>
                <ext:Store runat="server" ID="s_store" OnReadData="on_read_data_xjllsjtz" PageSize="20" RemotePaging="False"  > 
                    <Model>
                        <ext:Model runat="server">
                            <Fields>
                                <ext:ModelField Name="VouchId"></ext:ModelField>
                                <ext:ModelField Name="Ddate"></ext:ModelField> 
                            </Fields>
                        </ext:Model>
                    </Model>
                    <Proxy>
                        <ext:PageProxy> 
                        </ext:PageProxy>
                    </Proxy>
                </ext:Store> 
            </Store>
            <ColumnModel>
                <Columns> 
                    <ext:Column ID="Column1" runat="server" DataIndex="Ddate" Text="日期"></ext:Column>
                </Columns>
            </ColumnModel>
            <BottomBar> 
                     <ext:Toolbar runat="server">
                         <Items>
                             <ext:PagingToolbar runat="server" StoreID="s_store"></ext:PagingToolbar>
                         </Items>
                     </ext:Toolbar> 
            </BottomBar>
        </ext:GridPanel>

 protected void on_read_data_xjllsjtz(object sender, StoreReadDataEventArgs e)
        {
            int start = e.Start;
            int limit = e.Limit;
            int total = 0;
            var ll = cashflowDataAdjustService.GetCashflowDataAdjust(start, limit,out total);
           // var page = new Paging<CashflowDataAdjust1> (ll, total);
            e.Total = total;
            s_store.DataSource = ll;

            s_store.DataBind();
        }

I find that when page loads , the start and the limit is -1,how to pass start and limit from front page. I notice ajaxproxy uses Paging class,
whether Paging class must use in pageproxy or not?