⚡ VB.NET Asynchronous Programming

Async programming lets you run long tasks without freezing your app’s UI. You use Async methods with Await to pause execution until tasks finish — but the UI stays responsive.

📚 Example Code: Basic Async Method

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🔑 Pro Tip: Task.Delay(ms) is like Thread.Sleep, but async — it pauses without blocking your thread or freezing UI.

🔧 How It Works

Async Function lets you use Await inside.
Await Task.Delay() pauses the method without blocking.
The method returns a Task that can be awaited or run on its own.
UI thread stays smooth because it’s not blocked.

📂 Example Code: Async Method Returning Result

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⚠️ Exception Handling in Async

Wrap your Await calls inside Try...Catch to catch exceptions from async methods.

🧰 Example Code: Async with Try...Catch

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💡 Always handle exceptions in async code to prevent app crashes and weird bugs.

⚡ Quick Tips

Use Async/Await for I/O, file, network, or long CPU-bound tasks.
Don’t mix blocking calls like Thread.Sleep in async code — use Task.Delay instead.
In UI apps (WinForms, WPF), async keeps the interface responsive while working behind the scenes.
Async Sub is mainly for event handlers — avoid it elsewhere to allow proper error handling.