IO异常未得到处理.进程无法访问该文件，因为它正在被使用

我写了一个程序，代码似乎可以工作，但它不工作。它给出IO异常是未处理的错误。有些人说，你们应该删除一些东西，因为程序试图在同一时间使用相同的文件。请帮帮我！！

      namespace App1508
     {
       public partial class Form2 : Form
      { 
      string goodDir = "C:''GOOD''";
      string badDir = "C:''BAD''";
      string fromDir = "C:''DENEME''";
      List<Image> images = null;
      int index = -1;
      FileInfo[] finfos = null;
       public Form2()
      {
          InitializeComponent();
          DirectoryInfo di = new DirectoryInfo(@"C:'DENEME");
          finfos = di.GetFiles("*.jpg",SearchOption.TopDirectoryOnly);
          images = new List<Image>();
          foreach (FileInfo fi in finfos)
         {
             images.Add(Image.FromFile(fi.FullName));
         }
       }
        private void button1_Click(object sender, EventArgs e)
       {
         finfos[index].MoveTo(Path.Combine("C:''GOOD", finfos[index].Name));
       }
         private void pictureBox1_Click(object sender, EventArgs e)
       {
        index++;
        if (index < 0 || index >= images.Count)
        index = 0;
        pictureBox1.Image = images[index];
        }
         private void button2_Click(object sender, EventArgs e)
        {
           finfos[index].MoveTo(Path.Combine("C:''BAD", finfos[index].Name));
         }
        }
       }

foreach (FileInfo fi in finfos)
{
    images.Add(Image.FromFile(fi.FullName));
}