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I would like to access Service Bus Queues and Topics from Workflows with some specific activities. I couldn't find anything fitting this scenario ( this MSDN article and this article by Roman Kiss ) are the nearest one. I would like to design a custom activity which uses the QueueClient to receive asynchronously the brokered messages, using the BeginReceive method implemented with the async/await pattern (please see my question about it). First of all, I would like to ask if it there are any reasons why I should prefer the suggested approach (adapted WCF) instead of my desired one (using the QueueClient). Then, I would appreciate help designing it in a persistence-friendly way. Update: This is what I tried so far: public class AsyncReceiveBrokeredMessage : AsyncCodeActivity<BrokeredMessage> { [RequiredArgument] public InArgument<string> ConnectionString { get; set; } [RequiredArgument] public InArgument<string> Path { get; set; } protected sealed override IAsyncResult BeginExecute(AsyncCodeActivityContext context, AsyncCallback callback, object state) { var connectionString = this.ConnectionString.Get(context); var path = this.Path.Get(context); var queueClient = QueueClient.CreateFromConnectionString(connectionString, path); var cts = new CancellationTokenSource(); context.UserState = new ReceiveState { CancellationTokenSource = cts, QueueClient = queueClient

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