How to do it? I try to do it and i have no idea :/ : How to call form method from another object method?

I tried to pass the Form throgh the reference but it giving:
'Form' does not contain a definition for and no extension method accepting a first argument of type 'Form' could be found (are you missing a using directive or an assembly reference?)

     
        public class Foo
        {
          public void FooVoid()
          {
            Form1.FormVoid();
          }
        }

        public void FormVoid()
        {

        }

        public Program()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

Any ideas ?