Session Exists on Child Pages

I wrote this class to check the session values
Imports Microsoft.VisualBasic Public Class UserCheck Inherits System.Web.UI.Page Private Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load If Session("AppMstID") Is Nothing Then Response.Redirect("~/index.htm", False) Exit Sub End If If Session("AppMstLoginName") Is Nothing Then Response.Redirect("~/index.htm", False) Exit Sub End If If Session("AppMstID") Is Nothing AndAlso Session("AppMstLoginName") Is Nothing AndAlso Session("TokenName") Is Nothing AndAlso Request.Cookies("TokenName") Is Nothing Then Response.Redirect("~/index.htm", False) Exit Sub End If If DBNull.Value.Equals(Session("TokenName")) = True Then Response. ...