C#--不断向左移动的小动画之猫鼠赛跑

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace WindowsFormsApplication4{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void timer1_Tick(object sender, EventArgs e)        {            this.pictureBox1.Left -=3;            if (this.pictureBox1.Right < 0)            {                this.pictureBox1.Left = this.Width;            }                  }        private void button1_Click(object sender, EventArgs e)        {            this.timer1.Start();                   }        private void button2_Click(object sender, EventArgs e)        {            this.timer2.Start();                    }        private void button3_Click(object sender, EventArgs e)        {            Close();        }        private void Form1_Load(object sender, EventArgs e)        {        }        private void timer2_Tick(object sender, EventArgs e)        {            this.pictureBox2.Left -= 3;            if (this.pictureBox2.Right < 0)            {                this.pictureBox2.Left = this.Width;            }        }        private void button4_Click(object sender, EventArgs e)        {            this.timer1.Stop();        }          }}