Use Controls In Class? (Winforms C#)

Question

I made a class with methods and events, but I need saw that this class doesn't allow me to use my Form's controls, (the class is declared into the form for), I need to modify my control properties into my settings, How can I do that?

Answer 1

maybe problem on Class Access Modifiers
https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/access-modifiers