public async Task<string> SaveActivity(string activity)
        {
            WCFProxy.AuthorisationManagerServiceClient authorisationManagerServiceClient = null;

            try
            {
                authorisationManagerServiceClient
                    = new WCFProxy.AuthorisationManagerServiceClient(new WSHttpBinding(),
                        new EndpointAddress(endpointAddress));

                var result = await authorisationManagerServiceClient.SaveActivityAsync(activity).ConfigureAwait(false);

                authorisationManagerServiceClient.Close();

                return result;
            }
            catch (Exception ex)
            {
                if (authorisationManagerServiceClient != null)
                {
                    authorisationManagerServiceClient.Abort();
                }

                var serviceResponse = new ServiceResponse(ex.Message, true);
                var response = Serializer.SerializeToJson(serviceResponse);
                return response;
            }
        }
        public async Task<string> RemoveRoleFromUser(string roleId, string userId)
        {
            WCFProxy.AuthorisationManagerServiceClient authorisationManagerServiceClient = null;

            try
            {
                authorisationManagerServiceClient
                    = new WCFProxy.AuthorisationManagerServiceClient(new WSHttpBinding(),
                        new EndpointAddress(endpointAddress));

                var result = await authorisationManagerServiceClient.RemoveRoleFromUserAsync(roleId, userId).ConfigureAwait(false);

                authorisationManagerServiceClient.Close();

                return result;
            }
            catch (Exception ex)
            {
                if (authorisationManagerServiceClient != null)
                {
                    authorisationManagerServiceClient.Abort();
                }

                var serviceResponse = new ServiceResponse(ex.Message, true);
                var response = Serializer.SerializeToJson(serviceResponse);
                return response;
            }
        }