protected void Page_Load(object sender, EventArgs e)
        {
            if (HttpContext.Current.Session["condominio"] != null)
            {
                if (Request.QueryString["id"] != null)
                {
                    var idDocumento = Request.QueryString["id"].Trim();
                    var fileName = "documenti/" + idDocumento + ".pdf";

                    if(!File.Exists(Request.PhysicalApplicationPath + fileName))
                    {
                        var service = new SferaService();
                        var info = new UserInfo(0, 1);
                        var documento = service.GetDocumentoByIdentificativo(idDocumento, info);
                        var docInfo = service.GetDocument(documento.ID, TipoDocumentoArchiviazione.FatturaPassiva, info);

                        var fs = File.Create(Request.PhysicalApplicationPath + fileName);
                        var writer = new BinaryWriter(fs);
                        writer.Write(docInfo.Body);
                        writer.Close();
                        fs.Close();
                        fs.Dispose();
                    }

                    documentFrame.Attributes.Add("src", fileName);
                }
            }
        }