async

Guide C# asynchronous programming patterns including async/await and CancellationToken.

Updated Feb 17, 2026

Search Tags:#concurrency #async #deadlock #c##await #task

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npx skills add https://github.com/Objective-Arts/lens-dist --skill async

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Please help me install this Agent Skill.
Skill: async
Source: https://github.com/Objective-Arts/lens-dist/tree/main/canon/async
Command: npx skills add https://github.com/Objective-Arts/lens-dist --skill async

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps developers write correct, efficient, and deadlock-free asynchronous code in C#, preventing common pitfalls and improving application scalability.

Core Features & Use Cases

Async/Await Best Practices: Learn and apply the core principles of asynchronous programming.
Deadlock Prevention: Understand and avoid common deadlocks caused by blocking async operations.
Error Handling: Implement robust error handling for asynchronous tasks.
Concurrency Patterns: Utilize Task.WhenAll for efficient parallel execution.
Use Case: Refactor existing synchronous code that is causing performance bottlenecks or deadlocks by applying these async patterns, leading to a more responsive and scalable application.

Quick Start

Review the core principles for writing correct asynchronous code in C#.

Frequently Asked Questions about async

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

Why does my C# async await code deadlock and how do I prevent it?▼

C# async await deadlocks typically occur when blocking async operations capture the synchronization context. Prevent these deadlocks by applying ConfigureAwait(false) and avoiding blocking calls on asynchronous tasks.

How do I handle errors and cancellation in C# asynchronous tasks?▼

To handle errors in C# asynchronous tasks, you implement robust error handling using try/catch blocks. For cancellation, you pass a CancellationToken to your async methods to gracefully terminate operations when requested.

What is the best way to run multiple C# async tasks in parallel?▼

The best way to run multiple C# async tasks in parallel is utilizing Task.WhenAll. This concurrency pattern efficiently executes multiple asynchronous operations concurrently and waits for all of them to complete.

When should I use ValueTask instead of Task in C# async programming?▼

You should use ValueTask instead of Task in C# async programming when an asynchronous operation often completes synchronously. ValueTask reduces memory allocations and improves performance in high-throughput concurrency scenarios.

How do I refactor synchronous C# code to prevent performance bottlenecks?▼

Refactor synchronous C# code by applying async await patterns and proper error handling. This asynchronous refactoring eliminates performance bottlenecks, prevents deadlocks, and leads to a more responsive, scalable application.