code

    private void GetDoc(string DocName, string Doc)
        {
            System.IO.File.WriteAllText(DocName, Doc);
            MessageBox.Show("Файл записан, имя файла " + DocName);
        }
        [CallbackBehavior(UseSynchronizationContext = false)]
        public class AgencyCallback : ServiceReference1.IService1Callback
        {
            public delegate void FormDelegate(string DocName, string Doc);
            public event FormDelegate FormEvent;
            public void FormatDocCallback(string DocName, string Doc)
            {
                FormEvent?.Invoke(DocName, Doc);
            }

        }