Passing a querystring by post and enters it into a Data source of another page

<form id="Form1" method="post" runat="server"><li class="dropdown"> <a class="dropdown-toggle" data-toggle="dropdown" href="../Reports/Login.aspx" onclick="parentNode.submit();"> <input type="hidden" name="PersonnelID" value=<%= Session["userId"] %>/> <i class="fa fa-envelope fa-fw"></i> <i class="fa fa-caret-down"></i> Login Report </a> <!-- /.dropdown-messages --> </li></form> <%@ Page Title="" Language="C#" MasterPageFile="~/RCS_Master.Master" AutoEventWireup="true" CodeBehind="Login.aspx.cs&q ...