carlo990:
Thank you sir. We can adjust to the language that we'll use for the GUI. We can also use C++ if it would be better.With that being said, will all of these be possible if ever?
It's definitely possible. But you're still asking in the wrong place. Writing code for Windows serial communications is a whole different ballgame to writing serial code for an Arduino, whether you use C# or C++.
You need to ask for help on the GUI app in an appropriate place, to have the best chance of getting help. An Arduino forum is not the best place.
And no one will write the code for you. You need to make a start, then ask for help when you strike problems.
Surely there are plenty of Windows programming forums, whether for C++ or C#?