Hardwell--like other DJ's, like Martin Garrix, Afrojack and Tiesto--performs weekly in radio shows and YouTube, mixing tracks the way only he knows how. His radio show is called "Hardwell On Air," a 1-hour set. I have to admit that there are some sets that are not good, but there also really good sets! You can listen to him in YouTube and also listen to him live Fridays at 5:00pm in 94.9 radio.
I enjoy most of his sets and listen to the while I do my homework, which lets me do it really fast!
Anyway, I hope you can find some time to listen to him and enjoy his sets yourselves!