Session variables not updating

Does anyone know why I need to do a page refresh in order for my session variables to update a page?
I have a shopping cart page where I apply a discount, the discount is kept in a session variable, when it applies the page does not update unless I do a refresh. I did not show the code because it it has several includes and would fill up a few pages. Right now I am just looking for a direction to look at.
usky1Asked:
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erikTsomikSystem Architect, CF programmer Commented:
in order to update the session variable you need to redirect the page
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SidFishesCommented:
"why I need to do a page refresh in order for my session variables to update a page?"

a session variable is set on the server side so a trip to the server is always required. It is possible to update a session var using an ajax call so it -looks- like there was no refresh but there still has to be a server hit
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erikTsomikSystem Architect, CF programmer Commented:
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usky1Author Commented:
I'll take a look at using an ajax solution.
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