c#:在子项目上显示工具提示

using System;
using System.Windows.Forms;

namespace ToolTipExample
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            InitializeToolTip();
        }

        private ToolTip toolTip1;
        private Button button1;

        private void InitializeToolTip()
        {
            toolTip1 = new ToolTip();
            button1 = new Button();
            button1.Text = "Click me";
            button1.Location = new Point(10, 10);
            button1.Size = new Size(75, 25);
            button1.Click += new EventHandler(button1_Click);
            this.Controls.Add(button1);

            // Set up the ToolTip text for the Button control.
            toolTip1.SetToolTip(button1, "This is a ToolTip");
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Button clicked");
        }
    }
}