It seems like it would be good to change the lecture method. In particular, it seems like it would be good to explain in detail the design content of how to proceed with the last lecture through winform and explain the code based on the pre-written code. The reason for using singleton, etc.. (It would be good to refer to the lecture content of the person who teaches tcp/ip with cpp in inflearn.) If the lecture method is to proceed as live coding, it would be good to explain it sufficiently.