Please post example of how to do this. thank you

to add to DarkSoul's reply you need to either pass form1 or the object
you wish to talk to in as a parameter to form2 or populate an existing
value in form2

public class Form1
{
    public string objectname = "";

    public somemethod()
    {
        // Create form2 here and pass a reference to Form1 to                 // the
constructor of form2
       
        Form2 frm = new Form2(this);

        // or populate a property of Form2 like this

        frm.somepropertyname = this; // you could also populate
        this property with whatever object you wish
        frm.Show();
    }
}

public class Form2
{
    public Form thecallingform;

    public Form2(Form frm)
    {
        this.thecallingform = frm;
    }

    public void anothermethod()
    {
        this.thecallingform.objectname = "foo";
    }
}

hope this helps