C# :: How To Send A Command To Another Form

I've been trying to send a command to another form, but it didn't work. Here's what I've done:

Form1:
I have a listview.

Form2:
I have a textbox and button.

I want to write something on the textbox from Form2, click on the button and let it appear on the listview on Form 1.

Here's my code, but doesn't work />

Form1
public void UpdateListBox(string data) {
ListViewItem lvi = new ListViewItem(data);
listView1.Items.Add(lvi);
}

Form2
private void button1_Click(object sender, EventArgs e) {
Form1 frm1 = new Form1();
frm1.UpdateListBox(textBox1.Text);
}