public Vergleicher(string text, string img1, string img2)
        {
            InitializeComponent();
            label1.Text = text;
            pictureBox1.ImageLocation = img1;
            pictureBox2.ImageLocation = img2;
            double quellsize = new FileInfo(img1).Length;
            double zielsize  = new FileInfo(img2).Length;

            labelquellinfo.Text = FileSize.GetFileSize(quellsize) + "; " + new FileInfo(img1).LastWriteTime;
            labelzielinfo.Text  = FileSize.GetFileSize(zielsize) + "; " + new FileInfo(img2).LastWriteTime;
        }