请教如何获得datalist的值

请教一个很菜的问题，因为最近刚转用C#写一段程序，很多地方不熟悉，前台代码：<asp:DataList ID="DataList1" runat="server" CellPadding="4" 
                        ForeColor="#333333" Width="100%"
                        RepeatColumns="3" RepeatDirection="Horizontal" 
                    onselectedindexchanged="DataList1_SelectedIndexChanged">
                        <FooterStyle BackColor="White" Font-Bold="True" ForeColor="White" />
                        <AlternatingItemStyle BackColor="White" />
                        <ItemStyle BackColor="White" ForeColor="#333333" />
                        <SelectedItemStyle BackColor="#FFCC66" Font-Bold="True"
                             ForeColor="Navy" />
                        <HeaderStyle BackColor="#990000" Font-Bold="True"
                             ForeColor="White" />
                        <ItemTemplate>
                            <center><table><tr><td align="center" valign="baseline">
                            <a href='Stationdetail.aspx?cinvcode=<%# Eval("cinvcode") %>'>
                             <%-- <td> <asp:Label ID = "cinvcode "   Text=  <%#   Eval("cinvcode")   %>   /> </td>--%>
                               <img alt="" style="border-width:0px"
                                    src='../image/<%#Eval("smallphtofile") %>' /></a><br />
                               <a href='Stationdetail.aspx?cinvcode=<%# Eval("cinvcode") %>'>
                                  <%# Eval("cinvname")%></a><br />
                                  资源租赁价格：<%#Eval("iInvsprice")%>
                                  <tr>
<td>&nbsp;</td>
<td><asp:Button ID="btnBuy" runat="server" Text="加入购物车" OnClick="btnBuy_onclick" CausesValidation="False" /></td>
    </tr>
                                  
                                  </td></tr></table>
                            </center>
                            
                        </ItemTemplate>
                    </asp:DataList>这里展示的是一个资源，里面加了一个按钮，“加入购物车”
现在想点击这个按钮获得站点资源的编号值cinvcode，然后加入到购物车，不知道应该怎样获得这个值？
之前看到的都是findcontrol,然后获得label值，
不知道是我前台代码绑定有问题还是怎的？如何获得这里的cinvcode值呢？谢了，很急又很菜的问题。