How Do I Get Items In A Listbox That Is In Another Form

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C#

Hello all.

I have 2 Form in my project Form1 and Form2

I have to get items in a Listbox in Form2 when initializing in Form1.

Here is the code in Form1:

private void OnRosterItem(object sender, agsXMPP.protocol.iq.roster.RosterItem item)
        {
            if (InvokeRequired)
            {
                BeginInvoke(new XmppClientConnection.RosterHandler(OnRosterItem), new object[] { this, item });
                return;
            }
            if (item.Subscription == SubscriptionType.both)
            {
                for (int i = 0; i < listBox1.Items.Count; i++)
                {
                    if (item.Jid.ToString() == listBox1.Items[i].ToString())
                    {
                        listBox1.Items.Remove(item.Jid);
                    }
                }
                listBox1.Items.Add(item.Jid.ToString());
            }
        }

This Listbox1 is in Form2 how to get the items there.

Thank you