We suggest you use the new razor tutorial to learn how to do these things. This old tutorial still demos some edge cases not described there, which is why we still provide it.
This shows how to use Razor @RenderPage to show different views on the same page based on URL-Parameters.
Very practical for
More details about the feature here: http://2sexycontent.org/en-us/docsmanuals/feature.aspx?feature=2509
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If this is the first time you've seen DNN-Apps and would like to try one - just install 2sxc first, then install this app inside it.