[Solved] invoked function is not working in winforms [closed]

EDITED

You must pass the instance of FrmA into the constructor of FrmMenu.

In FrmA:

private void Print()
{
    FrmMenu ObjMain = new FrmMenu(this);
    ObjMain.Show();
}

In FrmMenu:

public FrmMenu(FrmA f2)
{
    f2.CreateButtons("NEW");
}