主窗體中包含一個標籤label1和一個按鈕button1

程式碼如下：

		public void ChangeLabel(string text)
		{
			label1.Text = text;
		}

		private void button1_Click(object sender, EventArgs e)
		{
			Thread th = new Thread(() =>
			{
				MyClass my = new MyClass();
				my.ChangeLabel += ChangeLabel;
				my.ChangeText("hello");
			});
			th.IsBackground = true;
			th.Start();
		}
 

程式碼如下：

		public delegate void ChangeLabelEventHandle(string text);
		public ChangeLabelEventHandle ChangeLabel;
		public void ChangeText(string text)
		{
			ChangeLabel(text);
		}