using System.Drawing;
using System.Windows.Forms;

namespace WinFormUtilHelpV2
{
  /// <summary>
  /// 基于.NET 2.0的Tooltip工具类
  /// </summary>
  public static class TooltipToolV2
  {
    /// <summary>
    /// 为控件提供Tooltip
    /// </summary>
    /// <param name="control">控件</param>
    /// <param name="tip">ToolTip</param>
    /// <param name="message">提示消息</param>
    public static void ShowTooltip(this Control control, ToolTip tip, string message)
    {
      Point _mousePoint = Control.MousePosition;
      int _x = control.PointToClient(_mousePoint).X;
      int _y = control.PointToClient(_mousePoint).Y;
      tip.Show(message, control, _x, _y);
      tip.Active = true;
    }
    /// <summary>
    /// 为控件提供Tooltip
    /// </summary>
    /// <param name="control">控件</param>
    /// <param name="tip">ToolTip</param>
    /// <param name="message">提示消息</param>
    /// <param name="durationTime">保持提示的持续时间</param>
    public static void ShowTooltip(this Control control, ToolTip tip, string message, int durationTime)
    {
      Point _mousePoint = Control.MousePosition;
      int _x = control.PointToClient(_mousePoint).X;
      int _y = control.PointToClient(_mousePoint).Y;
      tip.Show(message, control, _x, _y, durationTime);
      tip.Active = true;
    }
    /// <summary>
    /// 为控件提供Tooltip
    /// </summary>
    /// <param name="control">控件</param>
    /// <param name="tip">ToolTip</param>
    /// <param name="message">提示消息</param>
    /// <param name="xoffset">水平偏移量</param>
    /// <param name="yoffset">垂直偏移量</param>
    public static void ShowTooltip(this Control control, ToolTip tip, string message, int xoffset, int yoffset)
    {
      Point _mousePoint = Control.MousePosition;
      int _x = control.PointToClient(_mousePoint).X;
      int _y = control.PointToClient(_mousePoint).Y;
      tip.Show(message, control, _x + xoffset, _y + yoffset);
      tip.Active = true;
    }
    /// <summary>
    /// 为控件提供Tooltip
    /// </summary>
    /// <param name="control">控件</param>
    /// <param name="tip">ToolTip</param>
    /// <param name="message">提示消息</param>
    /// <param name="xoffset">水平偏移量</param>
    /// <param name="yoffset">垂直偏移量</param>
    /// <param name="durationTime">保持提示的持续时间</param>
    public static void ShowTooltip(this Control control, ToolTip tip, string message, int xoffset, int yoffset, int durationTime)
    {
      Point _mousePoint = Control.MousePosition;
      int _x = control.PointToClient(_mousePoint).X;
      int _y = control.PointToClient(_mousePoint).Y;
      tip.Show(message, control, _x + xoffset, _y + yoffset, durationTime);
      tip.Active = true;
    }
  }
}

using System;
using System.Windows.Forms;
using WinFormUtilHelpV2;

namespace TooltipToolV2Test
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void button1_Click(object sender, EventArgs e)
    {
      button1.ShowTooltip(toolTip, "button1_Click");
    }
    private void listBox1_Click(object sender, EventArgs e)
    {
      listBox1.ShowTooltip(toolTip, "listBox1_Click", 500);
    }
  }
}