C# How to update GUI from another thread?

Assuming I have a form named Form1:

1. public partial class Form1 : Form
2. {
3. public Form1()
4. {
5. InitializeComponent();
6. }
8. private void UpdateText(object text)
9. {
10. button1.Text = text.ToString();
11. }
13. private void Form1_Load(object sender, EventArgs e)
14. {
15. Thread th = new Thread(new ParameterizedThreadStart(UpdateText));
16. th.IsBackground = true;
17. th.Start("hello world");
18. }
19. }

Run the form, i got error "InvalidOperationException was unhandled"

Cross-thread operation not valid: Control 'button1' accessed from a thread other than the thread it was created on.

I fix the above error using the following lines:

1. private delegate void UpdateTextDel(object text);
2. private void UpdateText(object text)
3. {
4. if (button1.InvokeRequired)
5. button1.Invoke(new UpdateTextDel(UpdateText), text);
6. else
7. button1.Text = text.ToString();
8. }