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

namespace WindowsApplication7
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            label1.Location = new Point(label1.Location.X + 10, label1.Location.Y);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            int i = 0;
            for (i = 0; i < 500; i++)
                label1.Location = new Point(label1.Location.X + 5, label1.Location.Y);
        }
 private void button3_Click(object sender, EventArgs e)
        {

        }

        private void button4_Click(object sender, EventArgs e)
        {
            label1.Location = new Point(0, 0);



        }

        
        
    }
}

你在button3里写入如下代码，不知道是否是你想要的效果：

while (i < 500)
            {               
                label1.Location = new Point(label1.Location.X + 5, label1.Location.Y);               
                i++;
            }
            while (i > 0)
            {
                label1.Location = new Point(label1.Location.X - 5, label1.Location.Y);
                i--;
            }

谢谢啊