private void listView1_ItemDrag(object sender, ItemDragEventArgs e)
        {
            DoDragDrop(listView1.SelectedItems, DragDropEffects.Move | DragDropEffects.Copy);
         
        }
  private void pdfViewer1_DragEnter(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(typeof(ListView.SelectedListViewItemCollection)))
            {
                e.Effect = DragDropEffects.Copy;
            }
            else
                e.Effect = DragDropEffects.None;
        }
 private void pdfViewer1_DragDrop(object sender, DragEventArgs e)
        {
            ListView.SelectedListViewItemCollection selectedItems = (ListView.SelectedListViewItemCollection)e.Data.GetData(typeof(ListView.SelectedListViewItemCollection));
            foreach (ListViewItem item in selectedItems)
            {
                 name = item.Text;
            }
            location = new Point(e.X, e.Y);

            InitWebApp();
            var doc = pdfViewer1.Document;
                if (doc == null)
                    return;

                using (var testBmp = Bitmap.FromFile(name) as Bitmap)
                {
                    var locationOnPage = pdfViewer1.ClientToPage(pdfViewer1.CurrentIndex, location);
                    InsertImageAt(doc.Pages.CurrentPage, testBmp, locationOnPage);
                };
            pdfViewer1.ClearRenderBuffer();
            pdfViewer1.Invalidate();
            
        }