C#.09 PictureBox图片控件

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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; using _1.Properties;   namespace _1 {     public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();         }         string imagename="1";         private void timer1_Tick(object sender, EventArgs e)         {             if (imagename == "1")             {                 imagename = "2";                 pictureBox1.Image =Resources._2;             }             else if (imagename == "2")             {                 imagename = "3";                 pictureBox1.Image = Resources._3;             }             else if (imagename == "3")             {                 imagename = "4";                 pictureBox1.Image = Resources._4;             }             else if (imagename == "4")             {                 imagename = "5";                 pictureBox1.Image = Resources._5;             }             else if (imagename == "5")             {                 imagename = "1";                 pictureBox1.Image = Resources._1;             }         }         private void button1_Click(object sender, EventArgs e)         {             timer1.Interval=150;             timer1.Start();         }     } }