Check out some of the ASP.Net focused websites such as http://www.asp.net for tutorials, code samples and so forth. A Google search for "GridView sorting" will bring up 100's of hits. For the most part, learning to develop modules for DotNetNuke involves about 60% of learning the .Net framework, 30% of learning ASP.Net and only 10% of learning the DotNetNuke API.

You might also want to download the source code package for my DotNetNuke Forge/Codeplex project ContentDeJour. One of its features (for the edit control) is a GridView which implements a somewhat unique way of sorting on multiple columns and displaying an up/down triangle and sort-level indicatori n each column header that is participating in the sort .

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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

Thanks Paul
Thanks Bill