private T CreateOrGetType<T, U>(string contract) where T : ClientBase<U>
        {
            var Exists = ClientCache.OfType<T>().FirstOrDefault();
            if (Exists != null) return Exists;
            var obj = (T)typeof(T).GetConstructor(new[] { typeof(string) }).Invoke(new object[] { contract });

            obj.ClientCredentials.UserName.UserName = System.Configuration.ConfigurationManager.AppSettings["ServiceNow_UserName"].ToString();
            obj.ClientCredentials.UserName.Password = System.Configuration.ConfigurationManager.AppSettings["ServiceNow_Password"].ToString();
            ClientCache.Add(obj);
            return obj;
        }
        public ServiceNow.InsertChange.ServiceNowSoapClient CHG
        {
            get
            {
                return CreateOrGetType<ServiceNow.InsertChange.ServiceNowSoapClient, ServiceNow.InsertChange.ServiceNowSoap>("sn_insertchange");
            }
        }