Hi,
You can't directly use what you previously developed in VS, but you can most likely re-use some of your code and implement a control that can plug into a cms page. We have extensive documentation and video tutorials to help developers get up to speed.
However for a quick and dirty way to show some data you could use our built in support for saved queries. We have an article about populating a chart using a saved query, but you could just as easily data bind a grid to the data.
The hello world tutorial and how mojoPortal works are also essential reading.
Hope that helps,
Joe