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private void button1_Click(object sender, EventArgs e)
{
label1.Text = "hello";
Thread.Sleep(2000);
label1.Text = "world";
}
Thread th = new Thread(() =>
{
this.Invoke(new MethodInvoker(() => { label1.Text = "Hello"; }));
Thread.Sleep(5000);
this.Invoke(new MethodInvoker(() => { label1.Text = "World"; }));
});
th.Start();