Got it π Youβre asking about important classes / objects you should know for interviews in Azure Service Bus, Event Hub, and Event Grid (mostly in .NET SDK context).
Hereβs a developer-focused cheatsheet π
π Important Classes in Azure Messaging Services
π’ Azure Service Bus (Queues & Topics)
Namespace: Azure.Messaging.ServiceBus
ServiceBusClient β Entry point, create senders/receivers.
ServiceBusSender β Send messages to queue/topic.
ServiceBusReceiver β Receive messages from queue/subscription.
ServiceBusProcessor β Event-driven message processing (background).
ServiceBusMessage β Represents a message (body, headers, properties).
ServiceBusReceivedMessage β Received message (with lock tokens, etc.).
ServiceBusMessageBatch β Batch sending support.
ServiceBusSessionReceiver β Receive session-enabled messages (FIFO).
ServiceBusAdministrationClient β Manage queues, topics, subscriptions.
π Interview tip: Mention DLQ (Dead Letter Queue) via subPath + "/$DeadLetterQueue".
π£ Azure Event Hub (Streaming)
Namespace: Azure.Messaging.EventHubs
EventHubProducerClient β Send events to an Event Hub.
EventHubConsumerClient β Receive events from an Event Hub.
EventData β Represents a single event (body + metadata).
EventDataBatch β Efficient batch sending.
PartitionContext β Metadata about the partition being read.
ProcessEventArgs β Context in event handler when consuming.
ProcessErrorEventArgs β Error handling during processing.
EventProcessorClient (with Blob Storage Checkpointing) β
π Interview tip: Stress that partitioning + checkpointing are core to Event Hub.
π΅ Azure Event Grid (Event Routing)
Namespace: Azure.Messaging.EventGrid
EventGridPublisherClient β Send custom events to Event Grid.
EventGridEvent β Schema for custom events.
CloudEvent β Schema for CloudEvents standard (alternative to EventGridEvent).
EventGridSubscriber β Handles event subscription in apps.
System Events β Predefined classes for Azure services (e.g., StorageBlobCreatedEventData, ResourceWriteSuccessEventData).
π Interview tip: Emphasize two event models:
π Summary Table
| Service | Key Classes (C# SDK) | Focus Area |
|---|
| Service Bus | ServiceBusClient, ServiceBusSender, ServiceBusReceiver, ServiceBusProcessor, ServiceBusMessage, ServiceBusAdministrationClient | Reliable messaging (queues, topics, DLQ) |
| Event Hub | EventHubProducerClient, EventHubConsumerClient, EventProcessorClient, EventData, EventDataBatch | High-throughput streaming, partitions |
| Event Grid | EventGridPublisherClient, EventGridEvent, CloudEvent, EventGridSubscriber | Event routing, serverless triggers |
β‘ Elevator Pitch (If asked directly)
In Service Bus, think in terms of messages and processors (ServiceBusClient, ServiceBusSender, ServiceBusReceiver).
In Event Hub, focus on events and streaming consumers (EventHubProducerClient, EventHubConsumerClient, EventProcessorClient).
In Event Grid, itβs about publishing and subscribing events (EventGridPublisherClient, EventGridEvent, CloudEvent).