How to give and bind value to gridview inside another gridview on click on first gridview row using bootstrap collapse?

DataSet ds=sql.getds("select distinct (taskid),task_title,description from task where taskuser_id='" + Session["iduser"] + "'    ");
grdalloted.DataSource = ds;
            grdalloted.DataBind();
grdallotedUser.DataSource=sql.getds("select userid from task where taskid=

    <asp:GridView ID="grdalloted" runat="server" Width="100%" AutoGenerateColumns="false" GridLines="None">
        <Columns>
            <asp:TemplateField>
                <ItemTemplate>
                    <div class="box-body no-padding">
                        <div class="mailbox-controls">
                        <div class="table-responsive mailbox-messages">
                        <table class="table table-hover table-striped">
                        <tbody>
                        <tr>
                        <td class="mailbox-name">                       
                        <button type="button" class="btn btn-info" data-toggle="collapse" data-target="#demo<%# Eval("taskid") %>"><%# Eval("task_title") %>'</button>
                        <div id="demo<%# Eval("taskid") %>" class="collapse">
                            <%# Eval("task_title") %>'
                            <asp:GridView ID="grdallotedUser" runat="server">

                            </asp:GridView>
                         </div>
                    </td>
                    
                    <td class="mailbox-subject">
                        <asp:TextBox ID="TextBox2" runat="server" Width="320px"  Height="20px" ReadOnly="true" BorderStyle="None"  BackColor="#f9f9f9"  Text='<%# Eval("description") %>'></asp:TextBox>
                        
                    </td>
                  </tbody>
                </table>
                <!-- /.table -->
              </div>
              <!-- /.mail-box-messages -->
             </div>
                     </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>