How can I create a global checkbox array in c#?

I'd like to create a global checkbox array that's accessible from anywhere.

static class global
    {
       public static CheckBox[] checks = { checkBox1, checkBox2, checkBox3, checkBox4, checkBox6, checkBox7 }; 

    }

This code underlines the checkboxes and sais:

An object reference is required for the non-static field, or property 'WindowsFormsApplication4.Form1.checkbox1'