private void Update_Foto()
        {
            try
            {
                var BL = new tb_pt_articuloBL();
                var BE = new tb_pt_articulo();
                BE.articidold = articidold.Text.Trim();
                BE.docname = _nombreFoto.ToString();
                var ms = new System.IO.MemoryStream();

                if (foto.Image != null)
                {
                    foto.Image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                }

                BE.Foto = ms.GetBuffer();
                BL.Update_foto(EmpresaID, BE);
            }
            catch (Exception)
            {
                throw;
            }
        }