PKHeX.Form1.pbBoxSlot_MouseDown C# (CSharp) Method

        private void pbBoxSlot_MouseDown(object sender, MouseEventArgs e)
        {
            if (ModifierKeys == Keys.Control || ModifierKeys == Keys.Alt || ModifierKeys == Keys.Shift || ModifierKeys == (Keys.Control | Keys.Alt))
            { clickSlot(sender, e); return; }
            PictureBox pb = (PictureBox)(sender);
            if (pb.Image == null)
                return;

            pkm_from_slot = getSlot(sender);
            int offset = getPKXOffset(pkm_from_slot);
            if (e.Button != MouseButtons.Left || e.Clicks != 1) return;
            // Create Temp File to Drag
            string basepath = Application.StartupPath;
            Cursor.Current = Cursors.Hand;

            // Prepare Data
            Array.Copy(savefile, offset, pkm_from, 0, 0xE8);
            pkm_from_offset = offset;

            // Make a new file name based off the PID
            byte[] dragdata = PKX.decryptArray(pkm_from);
            Array.Resize(ref dragdata, 0xE8);
            PKX pkx = new PKX(dragdata, "Boxes");
            string filename = pkx.Nickname;
            if (filename != pkx.Species)
                filename += " (" + pkx.Species + ")";
            filename += " - " + pkx.PID + ".pk6";

            // Make File
            string newfile = Path.Combine(basepath, Util.CleanFileName(filename));
            try
            {
                File.WriteAllBytes(newfile, dragdata);

                string[] filesToDrag = { newfile };
                DoDragDrop(new DataObject(DataFormats.FileDrop, filesToDrag), DragDropEffects.Move);
                File.Delete(newfile); // after drop, delete the temporary file
            }
            catch (ArgumentException x)
            { Util.Error("Drag & Drop Error:", x.ToString()); }
            File.Delete(newfile);
            pkm_from_offset = 0;
        }
        private void pbBoxSlot_DragDrop(object sender, DragEventArgs e)