public async Task AnonymiseAddressData() { var addresses = await GetAllAddresses(); var collectionUri = _documentDbHelper.CreateDestinationAddressDocumentCollectionUri(); var client = _databaseClient.CreateDestinationDocumentClient(); var databaseName = "addresses"; var databaseCollection = "addresses-anonymised"; client.CreateDocumentCollectionIfNotExistsAsync( UriFactory.CreateDatabaseUri(databaseName), new DocumentCollection { Id = databaseCollection }). GetAwaiter() .GetResult(); foreach (var addr in addresses) { if (addr.Address1 != null) { addr.Address1 = addr.Address1.Replace(" ", _utils.RandomString()) + _utils.RandomString(); } if (addr.Address2 != null) { addr.Address2 = addr.Address2.Replace(" ", _utils.RandomString()) + _utils.RandomString(); } if (addr.Address3 != null) { addr.Address3 = addr.Address3.Replace(" ", _utils.RandomString()) + _utils.RandomString(); } if (addr.Address4 != null) { addr.Address4 = addr.Address4.Replace(" ", _utils.RandomString()) + _utils.RandomString(); } if (addr.Address5 != null) { addr.Address5 = addr.Address5.Replace(" ", _utils.RandomString()) + _utils.RandomString(); } if (addr.PostCode != null) { addr.PostCode = _utils.GenPostCode(); } var response = await client.CreateDocumentAsync(collectionUri, addr); } }