Hello Stuart Radlett,
I'm not sure I understand what you want to achieve. If you have some Sitefinity page with a form on it you could assign a code-behind class to this page and implement a Page_Load event handler where you could simply read the value of Request.QueryString["EventCode"]. Then you can lookup the value in the database using some ADO.NET classes or if the database is mapped through OpenAccess - using the OA model classes.
Does this answer you question?
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