Async/Await & Task Programming
Master asynchronous programming patterns in .NET Core for better performance and responsiveness. This is a foundational concept in cross-platform .NET development that professional developers rely on daily. The explanations below are written to be beginner-friendly while covering the depth and nuance that comes from real-world .NET Core experience. Take your time with each section and practice the examples
80 min•By Priygop Team•Last updated: Feb 2026
Async/Await Fundamentals
Example
// Basic async method
public async Task<string> GetDataAsync()
{
using var httpClient = new HttpClient();
var response = await httpClient.GetStringAsync("https://api.example.com/data");
return response;
}
// Async with cancellation
public async Task<string> GetDataWithCancellationAsync(CancellationToken cancellationToken)
{
using var httpClient = new HttpClient();
var response = await httpClient.GetStringAsync("https://api.example.com/data", cancellationToken);
return response;
}
// ConfigureAwait for library code
public async Task<string> LibraryMethodAsync()
{
var result = await SomeAsyncOperation().ConfigureAwait(false);
return result;
}Advanced Async Patterns
Example
// Task.WhenAll for parallel execution
public async Task<(string, string)> GetMultipleDataAsync()
{
var task1 = GetDataAsync("url1");
var task2 = GetDataAsync("url2");
var results = await Task.WhenAll(task1, task2);
return (results[0], results[1]);
}
// Task.WhenAny for first completion
public async Task<string> GetFirstAvailableDataAsync()
{
var tasks = new[]
{
GetDataAsync("primary-url"),
GetDataAsync("backup-url1"),
GetDataAsync("backup-url2")
};
var completedTask = await Task.WhenAny(tasks);
return await completedTask;
}
// Async streams (IAsyncEnumerable)
public async IAsyncEnumerable<string> ReadLinesAsync(string filePath)
{
using var reader = new StreamReader(filePath);
string? line;
while ((line = await reader.ReadLineAsync()) != null)
{
yield return line;
}
}