Form1'deki textboxa girileni Form2'deki listboxa nasıl eklerim

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            ListBox1 = listBox1;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Form2 yeniform = new Form2(this);
            yeniform.Show();
        }

        public ListBox ListBox1 { get; set; }
    }

    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private Form1 anaForm = null;
        public Form2(Form form)
        {
            InitializeComponent();
            anaForm = form as Form1;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.anaForm.ListBox1.Items.Add(textBox1.Text);
            this.Close();
        }
    }