using (SqlConnection myConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString))

                    string QueryLingua="SELECT Lang FROM ArticoliGiorno WHERE IdArticolo = @Id";
                    
                    SqlCommand myCommand2 = new SqlCommand(QueryLingua, myConnection);
                   
                    myConnection.Open();

                    SqlDataReader StringaLingua = myCommand2.ExecuteReader();
                    
                    string prova = StringaLingua["Lang"].ToString();

                    TextBoxName_TextBoxWatermarkExtender.WatermarkText = prova;