private void pasteToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (Clipboard.GetDataObject().GetDataPresent("Bitmap"))
            {
                object o = Clipboard.GetDataObject().GetData("Bitmap");
                if (o != null)
                {
                    PBox.Image = (Image)o;
                    PBox.Width = PBox.Image.Width;
                    PBox.Height = PBox.Image.Height;
                }
            }
        }