I assume that you are asking how to pass parameters between two module controls. The most common method is to pass the key=value pair (such as "id=25")  in the query string when redirecting to the second control. For Michael Washington's tutorial on this approach and using the core NavigateUrl and EditUrl methods and in particular the method overload which accepts a parameter array of key=value pairs to create the url link please take a look here:

http://www.adefwebserver.com/DotNetNu...

Another suggestion is that since the DotNetNuke framework source code, core module source code, and that of DotNetNuke projects in the DotNetNuke Forge is available for download you can look at how controls such as securityroles.ascx and editrole.ascx pass parameters.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner