Passing value to gridview control from datalist linkbutton and showing the gridview in modal pop-up extender of linkbutton

Hi,
I am using the following code :

<asp:DataList ID="DataList1" runat="server" CellPadding="4" 
              DataSourceID="SqlDataSource1" ForeColor="#333333" Width="1023px" 
              onselectedindexchanged="DataList1_SelectedIndexChanged">
              <AlternatingItemStyle BackColor="White" ForeColor="#284775" />
              <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
              <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
              <HeaderTemplate>
                  <table class="style1">
                      <tr>
                          <td class="style5">
                              Name</td>
                          <td class="style6">
                              Details</td>
                          <td class="style2">
                              Rating</td>
                          <td>
                               </td>
                      </tr>
                  </table>
              </HeaderTemplate>
              <ItemStyle BackColor="#F7F6F3" ForeColor="#333333" />
              <ItemTemplate>
                  <table class="style1">
                      <tr>
                          <td class="style3">
                              <asp:Label ID="v_nameLabel" runat="server" CssClass="add" 
                                  Text='<%# Eval("v_name") %>' />
                          </td>
                          <td class="style4">
                              <table class="style1">
                                  <tr>
                                      <td>
                                           </td>
                                      <td>
                                          <asp:Label ID="v_mobileLabel" runat="server" CssClass="details" 
                                              Text='<%# Eval("v_mobile") %>' />
                                      </td>
                                  </tr>
                                  <tr>
                                      <td>
                                           </td>
                                      <td>
                                          <asp:Label ID="v_addLabel" runat="server" CssClass="details" 
                                              Text='<%# Eval("v_add") %>' />
                                      </td>
                                  </tr>
                              </table>
                          </td>
                          <td class="style2">
                              <asp:Label ID="ratingLabel" runat="server" CssClass="add" 
                                  Text='<%# Eval("rating") %>' />
                          </td>
                          <td class="style2">
                              <asp:LinkButton ID="LinkButtonmore" runat="server" Font-Names="Segoe UI" 
                                  Font-Size="Small" Font-Underline="False" ForeColor="#3C6090" 
                                  CommandArgument='<%# Eval("v_id") %>' onclick="LinkButtonmore_Click" >More</asp:LinkButton>
                              <asp:ModalPopupExtender ID="LinkButtonmore_ModalPopupExtender" runat="server" 
                                  DynamicServicePath="" Enabled="True" TargetControlID="LinkButtonmore" CancelControlID="Button1" PopupControlID="divViewDetails">
                              </asp:ModalPopupExtender>
                              
                          </td>
                      </tr>
                  </table>
              </ItemTemplate>
              <SelectedItemStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
          </asp:DataList>

whenever a user clicks on more link button the command argument fires the v_id which i want to convert to int at the code behind and fire a select query to show the list of the particular v_id meber in gridview in a modalpop-up.
During this whole process i am geting a null value from commandargument
Kindly give some suggestions to solve the above problem

Tags: C#, ADO.NET, ASP.NET, Gridview, DataGrid