To Pass Hidden field value as a parameter

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C#

C#4.0

Hi,
I wants to pass the value of hidden field having id gd_id1 as a parameter of StartGD method.The code is given below:

<asp:DataList ID="dListStudentNames" runat="server">
                  <HeaderTemplate>
                   <ItemTemplate>  
                     <input type="button" id="btnStart"  value="Start GD"; onclick="return StartGD();"  />&nbsp;&nbsp;                                     
                   </ItemTemplate>
                  </HeaderTemplate>
                      <ItemTemplate>
                          <table style="border: thin solid #FFFF00;">
                              <tr bgcolor="#a9b8a9">
                                  <td>
<input type="hidden" id="gd_id1" value='<%#Eval("GroupId") %>'/>
                                      <asp:Label ID="lblSlno" runat="server" Text="<%# Container.ItemIndex+1 %>"></asp:Label>&nbsp;
                                    <asp:Label ID="lblStudentName" runat="server" Text='<%#Eval("Studentname") %>'></asp:Label>

                                    <input id="gd_student_<%# Container.ItemIndex%>" type="hidden" value='<%#Eval("StudentId") %>' />

                                  </td>
                              </tr>
                              <tr>
                                  <td >


                                  </td>
                              </tr>
                          </table>
                      </ItemTemplate>
                  </asp:DataList

>

Please help me....Thanks in advance