This question has already been answered:
I am developing a program, writing code in Form1.cs, and there is a lot of code, I have to scroll the page up and down. Is it possible to break the code into several files? For example, Form1.cs Form1_code1.cs Form1_code2.cs But so that the code of each other is seen without any context throwing. Tell the template how to implement it or read the link.