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關(guān)鍵點(diǎn)有2點(diǎn)：

1、將此控件的背景顏色設(shè)為透明色，

2、將此控件和父控件關(guān)聯(lián)，即和PictureBox控件相關(guān)聯(lián)。

范例代碼如下：（關(guān)鍵性代碼已用黑體字表示）

范例功能：當(dāng)鼠標(biāo)在圖片上按下時(shí)，顯示“你好”，當(dāng)鼠標(biāo)抬起后，文字自動(dòng)消失。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace CCDTest
{
    public partial class Form1 : Form
    {
        string filename;
        Label lblResult;
        public Form1()
        {
            InitializeComponent();
            filename = Application.StartupPath + "\\cc1.bmp";
            lblResult = new Label();                                       
            lblResult.Location = new Point(0,0);
            lblResult.Parent = pbCCD;                                 //將label和picturebox（只是我命名為pbCCD而已）關(guān)聯(lián)！
            lblResult.BackColor = Color.Transparent;     //設(shè)置label的背景色為透明色。
            lblResult.Text = "你好！";
            lblResult.Visible = false;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            pbCCD.Load(filename);
        }

        private void pbCCD_MouseDown(object sender, MouseEventArgs e)
        {
            lblResult.Visible = true;
           
            lblResult.Location = e.Location;
        }

        private void pbCCD_MouseUp(object sender, MouseEventArgs e)
        {
            lblResult.Visible = false;
        }
    }