C# Visual Studio Item Templates

[@_-Skeptic-_]

You can just put your class files in a folder and add existing item to your project but add as a link or make a library and add the reference to your project. This way it will not be copied in each project that uses it. In your approach, I know you might like notepad++, it is not needed, just copy the file containing your class to any folder you like. Try using VS code which is a powerful editor where you can even run the code.