Is there a feasible way to pass variables in dnn between modules on different tabs without encoding it in the url? Session variables are apparently a no-no in DNN, and the .NET 2.0 option http://msdn2.microsoft.com/en-us/library/6c3yckfw(VS.80).aspx of PreviousPage won't work on controls inside modules?

Any suggestions?

Who says that session variables are a no-no in DNN???  Session variables, as well as all the other methods of dealing with retaining page state and passing values, has its pros and cons.  But it is not what it used to be in classic ASP pages, it should loose that stigma already and not be discarded right away as a big taboo.  Session variables in ASP.Net 2.0 (and even 1.1) are well implemented and a feasible alternative.  You need to understand the issues related to its use though, you don't want many concurrent users to save large datasets in them for instance, but for passing simple values from page to page, I don't see a problem with that.  This is actually my preferred way of doing it by the way, it keeps the URL clean and removes a possible application attack vector.  But again, I am not dealing with eBay kind of traffic levels.

Just in case you haven't realized this, session variables are kept in server memory (unless it is configured to be sent to a database, needed in server farms).

Carlos

use IMC, for more details on that check the Module Developer's Guide. in the documentation section.