Async and await make asynchronous programming feel approachable — but underneath lies a web of subtleties that catch even seasoned .NET developers off guard. This talk goes well beyond the basics: we'll start with tasks, I/O vs CPU-bound work, and common pitfalls like deadlocks and misused .Result calls, then work our way through exception handling, cancellation, and synchronization primitives. Finally, we'll dig into the advanced layer — ValueTask, IAsyncEnumerable, ConfigureAwait, AsyncLocal, channels, and concurrency limiters — giving you a complete picture of the modern async stack.

Basics
• Tasks and what they do
• I/O bound vs CPU bound (via Task.Run)
• Long-running tasks
• What about Threads?
• WhenAll/WhenAny
• Result/Wait and deadlocks
• Async suffix
• Thread.Sleep -> Task.Delay
• WaitAsync
• Parallel.ForEachAsync
• WhenEach (.NET 9)

Exception handling, synchronization, cancellation
• Old-style vs new style (OS-provided vs .NET provided)
• TaskCompletionSource
• CancelationTokenSource, OperationCanceledException and ThrowIfCancellationRequested
• AggregateException
• SemaphoreSlim
• Don't use "lock", Monitor, Mutex, etc

Advanced
• Exceptions and how they are captured in a Task
• AsyncLocal
• ValueTask
• IAsyncDisposable
• ConfigureAwait
• GetAwaiter
• IAsyncEnumerable
• Channel
• ConcurrencyLimiter