把檔案拖曳到視窗上

private void listBox1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
{
 string[] s = (string[]) e.Data.GetData(DataFormats.FileDrop, false);
 int i;
 for(i = 0; i < s.Length; i++)
  listBox1.Items.Add(s[i]);
}

//參考http://support.microsoft.com/kb/307966/en-us