Declaration of office

[Lubaaa]

No, you need Form1 instance for this. It looks like you started to work with C++/CLI without C++ experience. I suggest you to learn C++ first.

In Motory.cpp you need to have variable of type Form1^, which must be initialized to existing Form1 reference. Having this reference, you can call class methods. I cannot show exactly how to do this, because I don't know your program structure.

How do I create a global pointer to Form1, which provide access to its methods?

I tried: public: System:: Windows:: Forms:: Form ^ Fun;