ASP Classic Session Variable Not Always Getting Set

like below fixes the issue You need to add the selected attribute on the option that needs to be selected. Here is how:

While not rs.eof
    response.write("<option value=" & rs("shortcode"))
    if rs("shortcode") & "" = session("operator") then
        response.write(" selected")
    end if
    response.write(">" & rs("username") & "</option>")
    rs.movenext
Wend

Does that help First of all ASP.NET is not an updated version of classic ASP.
Session in ASP.Net In ASP.NET, every Web page derives from the System.Web.UI.Page class. The Page class aggregates an instance of the HttpSession object for session data. In this example, a custom Page class called SessionPage is derived from the System.Web.UI.Page to offer all the same features as the Page class. The only difference with the derived page is that the default HttpSession is overridden with a custom session object.

With these it helps By assuming both PHP and ASP applications share the same domain name, here's a step by step guide.
1 - Create an asp file named sessionConnector.asp.

<%@Language=VBScript CodePage=65001%>
<!--#include file="JSON.asp"-->
<%
Set JSONObject = jsObject()

For Each Key In Session.Contents
    If Not IsObject(Session.Contents(Key)) Then 'skip the objects cannot be serialized
        JSONObject(Key) = Session.Contents(Key)
    End If
Next

JSONObject.Flush
%>

function GetASPSessionState(){
    if(stripos($_SERVER["HTTP_COOKIE"], "ASPSESSIONID") === false){
        # since ASP sessions stored in memory 
        # don't make request to get ASP session state if the cookie does not contain ASPSESSIONID
        # otherwise IIS will create new redundant sessions for each of your checks so it wouldn't be a memory-friendly way
        # returning an empty array
        return array();
    } else {
        $options = array('http' => 
            array('method'=>"GET", 'header' => "Cookie: " . $_SERVER["HTTP_COOKIE"])
        );
        $cx = stream_context_create($options);
        $response = file_get_contents("http://mywebsite.com/sessionConnector.asp", false, $cx);
        return json_decode($response, JSON_FORCE_OBJECT);
    }
}

$aspSessionState = GetASPSessionState();
if($aspSessionState["IsLoggedIn"] == true){
    //user previously logged in with the ASP
}

I hope this helps you . You need to concatenate the session variable Session("USERCODE") into the string using the string concatenation character &, unlike other languages VBScript doesn't infer a variable just by placing it inside the string.

Dim report: report = "<script type=""text/javascript"">window.open(""http://somesite.com/payvoucher.aspx?usercode=" & Session("USERCODE") & """,""_self"");</script>"
Call Response.Write(report)

it should still fix some issue There are basically two approaches, though it's been a long time since I've dealt with either, so this is almost completely from memory, with a little help from some Microsoft documentation pages that are still hanging around:

Dim objStuff
Set objStuff = Server.CreateObject("Stuff.MyStuff")
objStuff.DoSomething Session("ASessionVariable")

Public Sub DoSomething() 
    Dim objContext As ObjectContext 
    Dim objResponse As Response 
    Dim objSession As Session
    Set objContext = GetObjectContext() 
    Set objResponse = objContext("Response") 
    Set objSession = objContext("Session")

    objResponse.Write "Session value: " & objSession("ASessionVariable")
End Sub

Dim objStuff
Set objStuff = Server.CreateObject("Stuff.MyStuff")
objStuff.DoSomething