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        private void listView1_DragDrop(object sender, DragEventArgs e)
        {
            // Handle FileDrop data
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
                foreach (string actfile in files)
                {
                    listView1.Items.Add(actfile);
                }
            }
            txtCountFiles.Text = "Anzahl Bilder: " + listView1.Items.Count ;
        }					

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        private void listView1_DragEnter(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                e.Effect = DragDropEffects.Copy;
            }
            else
            {
                e.Effect = DragDropEffects.None;
            }
        }