In this case, I upgrade DNN 4 version (04.09.05) to DNN 6 (06.02.06). Firstly I pretty confused to upgrade this CMS, how the step by step to do it. Many references in Internet, but it make me confuse. Then I find the best reference, i.e: http://dotnetnuke.bz/Home/tabid/96/DotNetNuke/147/How-to-Upgrade-DotNetNuke-Installation.aspx. After that, I try to make the step by step in simple thing.
Download DNN version from http://www.dotnetnuke.com/Resources/Wiki/Page/Suggested_Upgrade_Path.aspx, I prefer to download New Install than Version Upgrade because new installation already contain every things that we need, version upgrade may be missing something like module or settings.
Backup Existing Site (database and application files in IIS)
Change your database connection in web.config New Installation file according to the old one and also other setting in web config. It is according to your application configuration.
Copy all New Installation file and replace the old one (existing).
To make refresh, iisreset your IIS.
Open your …