I am now trying to use the DevExpress GridView that he used in the project for editing the data. I've never done a system like this (ASP.NET) before so there is a lot of learning to take place, feel free to guide me to suitable sites.

DevExpress is a great organization and when I worked with their controls (2010 -2012), I used to go to their forum to ask my questions. They were very responsive in a timely fashion.