Easy Question, online store Qty purchase

Question

I need a bit of help, and I'm not quite proficient in CF
really.
I have built a registration system in CF, which has three
steps (pages). On the last step, you can choose to return to Step 1
and register another person, OR you can choose to Pay Now.
I wanted to use session variable or cookies (I'm not really
certain of the difference) to have the system count silently the
number of times a visitor has gone through, and then when they do
hit "Pay Now", to multiply the variable count X the cost per
ticket.
This is what I have been doing:
on
Step 1, I define the variable session.Quantity with:
<cfif (NOT isDefined("session.Quantity ")) >
<cfset session.Quantity = "0" />
</cfif>
On
Step 2, we gather final registration info, and right after
the Insert statement, I increase the value of the session.Quantity
with:
<cfset session.Quantity =#session.Quantity #+1>
On
Step 3, I give them the option to Pay Now (which takes the
session.Quantity and successfully produces the cost) using:
<cfoutput> <cfset TotalCost = #session.quantity# *
75></cfoutput> (and then send them to payment and kill
session variable)
OR, I give them the chance to return to step 1 and go
through again.
NOW, this has been working just fine during my testing,
UNLESS you close down the browser mid stream (and happen to have
another one open in the background), which means that you didn't
pay and the session variable didn't get deleted.
THEN, when you return to the Step 1 again (20min) later,
because you want to do the registration over again, after your
first registration pass, you are already on session.Quantity = 4
(example).
OK, so I am a bit green, and I don't know much about the
application.cfm process (mine is below) or CFLOCK usage, but I
think this is part of my issue. I've read so much, and am now so
confused. Can someone give some clear advice and example that I
could work through, pertinent to this problem.
My cfapplication.cfm file:
<cfapplication name="Application1"
sessionmanagement="Yes"
sessiontimeout="#CreateTimeSpan(0,0,30,0)#"
applicationtimeout="#CreateTimeSpan(0,0,30,0)#"
>
<cfif StructKeyExists(session, "cfid") AND (NOT
StructKeyExists(cookie, "cfid") OR NOT StructKeyExists(cookie,
"cftoken"))>
<cfcookie name="cfid" value="#session.cfid#" />
<cfcookie name="cftoken" value="#session.cftoken#" />
</cfif>
Thanks to the SMART people out there,
Stephen
Tallahassee, FL

Answer 1

maybe you should start by reading the answers to your
previous post...
Azadi Saryev
Sabai-dee.com
Vientiane, Laos
http://www.sabai-dee.com