Why is this basic multi-threading in windows forms not working?

Question

I just wanted to implement the basic form of threading in win forms but can't seem to do it. Help? Basically wanted to populate the text boxes at different intervals.

---

protected void Button1_Click(object sender, EventArgs e)
{
                Thread work1 = new Thread(new 

                ThreadStart(changestate1));
                        work1.Start();

                    Thread work2 = new Thread(new ThreadStart(changestate4));
                    work2.Start();


                    Thread work3 = new Thread(new ThreadStart(changestate7));
                    work3.Start();
                }

                protected void changestate1()
                {
                    Thread.Sleep(999);
                    TextBox1.Text = "Work1";
                    changestate2();
                }
                protected void changestate2()
                {
                    Thread.Sleep(999);
                    TextBox2.Text = "Work1";
                    changestate3();
                }
                protected void changestate3()
                {
                    Thread.Sleep(999);
                    TextBox3.Text = "Work1";
                }
                protected void changestate4()
                {
                    Thread.Sleep(666);
                    TextBox4.Text = "Work2";
                    changestate5();
                }
                protected void changestate5()
                {
                    Thread.Sleep(666);
                    TextBox5.Text = "Work2";
                    changestate6();
                }
                protected void changestate6()
                {
                    Thread.Sleep(666);
                    TextBox6.Text = "Work2";
                }
                protected void changestate7()
                {
                    Thread.Sleep(333);
                    TextBox7.Text = "Work3";
                    changestate8();
                }
                protected void changestate8()
                {
                    Thread.Sleep(333);
                    TextBox8.Text = "Work3";
                    changestate9();
                }
                protected void changestate9()
                {
                    Thread.Sleep(333);
                    TextBox9.Text = "Work3";
                }

Answer 1

Try Joining Threads in main app.

protected void Button1_Click(object sender, EventArgs e)

 {
                Thread work1 = new Thread(new 

ThreadStart(changestate1));
                        work1.Start();

                    Thread work2 = new Thread(new ThreadStart(changestate4));
                    work2.Start();


                    Thread work3 = new Thread(new ThreadStart(changestate7));
                    work3.Start();

                   **work1.Join();
                   work2.Join();
                   work3.Join();**



                }

                protected void changestate1()
                {
                    Thread.Sleep(999);
                    TextBox1.Text = "Work1";
                    changestate2();
                }
                protected void changestate2()
                {
                    Thread.Sleep(999);
                    TextBox2.Text = "Work1";
                    changestate3();
                }
                protected void changestate3()
                {
                    Thread.Sleep(999);
                    TextBox3.Text = "Work1";
                }
                protected void changestate4()
                {
                    Thread.Sleep(666);
                    TextBox4.Text = "Work2";
                    changestate5();
                }
                protected void changestate5()
                {
                    Thread.Sleep(666);
                    TextBox5.Text = "Work2";
                    changestate6();
                }
                protected void changestate6()
                {
                    Thread.Sleep(666);
                    TextBox6.Text = "Work2";
                }
                protected void changestate7()
                {
                    Thread.Sleep(333);
                    TextBox7.Text = "Work3";
                    changestate8();
                }
                protected void changestate8()
                {
                    Thread.Sleep(333);
                    TextBox8.Text = "Work3";
                    changestate9();
                }
                protected void changestate9()
                {
                    Thread.Sleep(333);
                    TextBox9.Text = "Work3";
                }