Access Controls Properties From Another Window

I am trying to change a property from one control one a window from another. How would I add data that is in one window to a combobox in another? Thanks.

The easy way would be to have the form have a reference to the other form.

Can you give me an example. I am kind of new to C#

Ok well i will asume you are opening one form from the other.

Code:

---

class form1
{
    private form2 child;

    public form1()
    {
        child = new form2(this);
    }
}

class form2
{
    private form1 parent;

    public form2(form1 parent)
    {
        this.parent = parent;
    }
}

---

Simply put you could use the child object to access controls on form2 from form1 and the parent object to access controls on form1 from form2.