Bits of .NET

Deadlocks in async/await often come from sync-over-async and the UI/ASP.NET synchronization context.

var data = GetDataAsync().Result;   // ❌ Possible deadlock

🔥 Why This Happens

• The UI thread waits

• Async method tries to resume on the UI thread

• Both wait forever 😅

✔ The Fix

Use ConfigureAwait(false) in library code:

await SomeLibraryCall().ConfigureAwait(false);

💡 Pro Tips

• Never mix .Result or .Wait() with async

• For ASP.NET Core, sync context does NOT exist → fewer deadlocks

• Library devs should always use ConfigureAwait(false)