[非同期]Windows Formsで非同期でリストボックスに値を設定する

Form1.cs

using System;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            //Pattern.1 Control.BeginInvoke
            string[] listCodes1 = { "A", "B", "C", "D", "E", "F", "G", "H" };

            foreach (var listCode1 in listCodes1)
            {
                listBox1.Items.Add(listCode1);
            }
            if (listBox1.Items.Count > 0)
            {
                listBox1.SetSelected(0, true);

                //非同期実行
                var method = new Func<string[]>(() =>
                {
                    string[] result = { "D1", "D2", "D3" };
                    System.Threading.Thread.Sleep(3000);
                    return result;
                });
                method.BeginInvoke(ar =>
                {
                    var result = method.EndInvoke(ar);
                    //Control.BeginInvoke
                    listBox2.BeginInvoke((Action)(() =>
                    {
                        foreach (var item in result)
                        {
                            listBox2.Items.Add(item);
                        }
                    }));

                }, null);
            }
        }
    }
}

Form2.cs

using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
            //Pattern.2 Task
            string[] listCodes1 = { "A", "B", "C", "D", "E", "F", "G", "H" };

            foreach (var deptCode in listCodes1)
            {
                listBox1.Items.Add(deptCode);
            }

            if (listBox1.Items.Count > 0)
            {
                listBox1.SetSelected(0, true);

                Task<string[]>.Factory.StartNew(() =>
                {

                    string[] result = { "D1", "D2", "D3" };
                    System.Threading.Thread.Sleep(3000);
                    return result;
                }).ContinueWith(t =>
                {
                    foreach (var item in t.Result)
                    {
                        listBox2.Items.Add(item);
                    }

                }, TaskScheduler.FromCurrentSynchronizationContext());

            }
        }
    }
}

Form3.cs

using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form3 : Form
    {
        public Form1()
        {
            InitializeComponent();
            //Pattern.3 async/await
            SetListBox();
        }

        public void SetListBox()
        {
            string[] listCodes1 = { "A", "B", "C", "D", "E", "F", "G", "H" };

            foreach (var listCode1 in listCodes1)
            {
                listBox1.Items.Add(listCode1);
            }
            if (listBox1.Items.Count > 0) 
            {
                listBox1.SetSelected(0, true);
                AsyncMethod();
            }

        }

        public async void AsyncMethod()
        {
            string[] listCodes2 = await Task<string[]>.Run(() =>
            {
                string[] result =  { "D1", "D2", "D3" };
                System.Threading.Thread.Sleep(3000);
                return result;
            });
            foreach (var item in listCodes2)
            {
                listBox2.Items.Add(item);
            }
        }
    }
}