如何在forn1 c#中将值从form2 textbox传回列表框

public void AddItemToListBox(string value)
{
    listBox1.Items.Add(value);
}

public string TextBoxValue { get; set; }

private void button1_Click(object sender, EventArgs e)
{
    Form1 form1 = (Form1)Application.OpenForms["Form1"];
    form1.AddItemToListBox(textBox1.Text);
    TextBoxValue = textBox1.Text;
    this.Close();
}

private void button1_Click(object sender, EventArgs e)
{
    Form2 form2 = new Form2();
    form2.ShowDialog();
    string textBoxValue = form2.TextBoxValue;
    if (!string.IsNullOrEmpty(textBoxValue))
    {
        listBox1.Items.Add(textBoxValue);
    }
}