Learn 11 ASP.NET Core best practices with examples: async programming, memory management, HttpClientFactory, efficient middleware, and more to boost performance and scalability.<\/p>\n\n\n\n
Building a web app with ASP.NET Core is more than just writing endpoints and views \u2014 the real test is how your app behaves under load: how quickly it responds, how many users it can serve, and how stable it stays when things go wrong.<\/p>\n\n\n\n
Too often, developers assume \u201cif it works, it\u2019s good enough.\u201d<\/em> In reality, small inefficiencies \u2014 blocking threads, unnecessary memory allocations, or unoptimized database queries \u2014 can snowball into slowdowns, high resource usage, or even crashes.<\/p>\n\n\n\n For example:<\/p>\n\n\n\n The good news? These issues are avoidable. Below are 11 best practices<\/strong>, with examples, to help you build apps that are faster, more scalable, and production-ready.<\/p>\n\n\n\n When you block on I\/O, you waste threads. Always use \u274c Blocking example:<\/strong><\/p>\n\n\n\n \u2705 Async example:<\/strong><\/p>\n\n\n\n Don\u2019t dump entire tables into memory. Use paging or streaming.<\/p>\n\n\n\n \u274c Bad:<\/strong><\/p>\n\n\n\n \u2705 Better (with paging):<\/strong><\/p>\n\n\n\n Large arrays go into the LOH. Instead of recreating them every time, reuse with pooling.<\/p>\n\n\n\n \u2705 Using ArrayPool:<\/strong><\/p>\n\n\n\n Load only what you need.<\/p>\n\n\n\n \u274c Bad:<\/strong><\/p>\n\n\n\n \u2705 Better:<\/strong><\/p>\n\n\n\n For read-only queries:<\/p>\n\n\n\n Creating new \u2705 Good:<\/strong><\/p>\n\n\n\n Registered in Every request runs through middleware, so keep it efficient.<\/p>\n\n\n\n \u2705 Example:<\/strong><\/p>\n\n\n\n Don\u2019t block user requests with heavy tasks. Run them in the background.<\/p>\n\n\n\n \u2705 BackgroundService example:<\/strong><\/p>\n\n\n\n Reduce payload size with compression.<\/p>\n\n\n\n Each new .NET release comes with performance improvements<\/strong> (e.g., .NET 8 improved JSON serialization and async handling). Stay updated to benefit from these gains.<\/p>\n\n\n\n Exceptions should not be your logic flow.<\/p>\n\n\n\n \u274c Bad:<\/strong><\/p>\n\n\n\n \u2705 Better:<\/strong><\/p>\n\n\n\n Don\u2019t pass \u274c Bad:<\/strong><\/p>\n\n\n\n \u2705 Better:<\/strong><\/p>\n\n\n\n Making your ASP.NET Core app production-ready isn\u2019t just about \u201cmaking it work\u201d \u2014 it\u2019s about making it work well under real-world conditions<\/em>. The practices above \u2014 async programming, smart memory usage, efficient data access, lean middleware, and proper resource handling \u2014 are based on how the .NET runtime works and what typically breaks in production.<\/p>\n\n\n\n If your business needs help applying these principles in a real-world project, our team at InSync Software<\/a> can help. We specialize in building tailored solutions on ASP.NET Core that are fast, scalable, and designed around your business goals.<\/p>\n\n\n\n\n\n \ud83d\udc49 Your turn:<\/strong> Which of these best practices do you already follow in your ASP.NET Core projects? Share your thoughts in the comments \u2014 I\u2019d love to hear how you optimize your apps.<\/p>\n\n\n\n <\/p>\n","protected":false},"excerpt":{"rendered":" Learn 11 ASP.NET Core best practices with examples: async programming, memory management, HttpClientFactory, efficient middleware, and more to boost performance and scalability. Introduction Building a web app with ASP.NET Core is more than just writing endpoints and views \u2014 the real test is how your app behaves under load: how quickly it responds, how many […]<\/p>\n","protected":false},"author":1,"featured_media":188,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"pagelayer_contact_templates":[],"_pagelayer_content":"","footnotes":""},"categories":[18],"tags":[37,30,19],"class_list":["post-185","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software-development","tag-net","tag-c","tag-software"],"_links":{"self":[{"href":"https:\/\/www.insync.co.za\/blog\/wp-json\/wp\/v2\/posts\/185","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.insync.co.za\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.insync.co.za\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.insync.co.za\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.insync.co.za\/blog\/wp-json\/wp\/v2\/comments?post=185"}],"version-history":[{"count":3,"href":"https:\/\/www.insync.co.za\/blog\/wp-json\/wp\/v2\/posts\/185\/revisions"}],"predecessor-version":[{"id":192,"href":"https:\/\/www.insync.co.za\/blog\/wp-json\/wp\/v2\/posts\/185\/revisions\/192"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.insync.co.za\/blog\/wp-json\/wp\/v2\/media\/188"}],"wp:attachment":[{"href":"https:\/\/www.insync.co.za\/blog\/wp-json\/wp\/v2\/media?parent=185"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.insync.co.za\/blog\/wp-json\/wp\/v2\/categories?post=185"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.insync.co.za\/blog\/wp-json\/wp\/v2\/tags?post=185"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}\n
.Result<\/code>, .Wait()<\/code>) in ASP.NET Core can cause thread pool starvation<\/strong>. Threads get tied up waiting, leaving fewer available for new requests. Microsoft explicitly warns against blocking calls in hot code paths (Microsoft Learn<\/a>).<\/li>\n<\/ul>\n\n\n\n
\n\n\n\n1. Use Asynchronous APIs<\/h2>\n\n\n\n
async<\/code>\/await<\/code> for database, HTTP, and file calls.<\/p>\n\n\n\npublic IActionResult GetData()\n{\n var result = _service.GetDataAsync().Result; \/\/ Blocks thread\n return Ok(result);\n}\n<\/code><\/pre>\n\n\n\npublic async Task<IActionResult> GetData()\n{\n var result = await _service.GetDataAsync();\n return Ok(result);\n}\n<\/code><\/pre>\n\n\n\n
\n\n\n\n2. Avoid Returning Huge Lists<\/h2>\n\n\n\n
public async Task<IActionResult> GetUsers()\n{\n return Ok(await _db.Users.ToListAsync());\n}\n<\/code><\/pre>\n\n\n\npublic async Task<IActionResult> GetUsers(int page = 1, int pageSize = 50)\n{\n var users = await _db.Users\n .Skip((page - 1) * pageSize)\n .Take(pageSize)\n .ToListAsync();\n return Ok(users);\n}\n<\/code><\/pre>\n\n\n\n
\n\n\n\n3. Reuse Large Objects<\/h2>\n\n\n\n
var pool = ArrayPool<byte>.Shared;\nbyte[] buffer = pool.Rent(1024);\n\n\/\/ use buffer...\n\npool.Return(buffer);\n<\/code><\/pre>\n\n\n\n
\n\n\n\n4. Optimize Data Access<\/h2>\n\n\n\n
var users = await _db.Users.ToListAsync(); \n<\/code><\/pre>\n\n\n\nvar usernames = await _db.Users\n .Select(u => u.Username)\n .ToListAsync();\n<\/code><\/pre>\n\n\n\nvar users = await _db.Users\n .AsNoTracking()\n .ToListAsync();\n<\/code><\/pre>\n\n\n\n
\n\n\n\n5. Use
HttpClientFactory<\/code><\/h2>\n\n\n\nHttpClient<\/code> instances exhausts sockets. Use HttpClientFactory<\/code> instead.<\/p>\n\n\n\npublic class MyService\n{\n private readonly HttpClient _client;\n\n public MyService(HttpClient client)\n {\n _client = client;\n }\n\n public Task<string> GetDataAsync() =>\n _client.GetStringAsync(\"https:\/\/api.example.com\/data\");\n}\n<\/code><\/pre>\n\n\n\nProgram.cs<\/code>:<\/p>\n\n\n\nbuilder.Services.AddHttpClient<MyService>();\n<\/code><\/pre>\n\n\n\n
\n\n\n\n6. Keep Middleware Lean<\/h2>\n\n\n\n
app.Use(async (context, next) =>\n{\n var stopwatch = Stopwatch.StartNew();\n await next();\n stopwatch.Stop();\n Console.WriteLine($\"Request took {stopwatch.ElapsedMilliseconds}ms\");\n});\n<\/code><\/pre>\n\n\n\n
\n\n\n\n7. Offload Long Tasks<\/h2>\n\n\n\n
public class EmailQueueService : BackgroundService\n{\n protected override async Task ExecuteAsync(CancellationToken stoppingToken)\n {\n while (!stoppingToken.IsCancellationRequested)\n {\n var email = await _queue.GetNextAsync();\n await _emailSender.SendAsync(email);\n }\n }\n}\n<\/code><\/pre>\n\n\n\n
\n\n\n\n8. Minify & Compress Responses<\/h2>\n\n\n\n
builder.Services.AddResponseCompression();\napp.UseResponseCompression();\n<\/code><\/pre>\n\n\n\n
\n\n\n\n9. Use the Latest Versions<\/h2>\n\n\n\n
\n\n\n\n10. Use Exceptions Correctly<\/h2>\n\n\n\n
try\n{\n var user = await _db.Users.FirstAsync(u => u.Id == id);\n}\ncatch\n{\n return NotFound();\n}\n<\/code><\/pre>\n\n\n\nvar user = await _db.Users.FirstOrDefaultAsync(u => u.Id == id);\nif (user == null) return NotFound();\n<\/code><\/pre>\n\n\n\n
\n\n\n\n11. Be Careful with
HttpContext<\/code><\/h2>\n\n\n\nHttpContext<\/code> across threads or store it for later use.<\/p>\n\n\n\nTask.Run(() =>\n{\n var user = context.User.Identity.Name; \/\/ risky\n});\n<\/code><\/pre>\n\n\n\nvar user = context.User.Identity.Name;\n\/\/ Pass the value, not HttpContext itself\n<\/code><\/pre>\n\n\n\n
\n\n\n\nConclusion<\/h2>\n\n\n\n
Key Takeaways:<\/h3>\n\n\n\n
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\n\n\n\nReferences & Further Reading<\/h2>\n\n\n\n
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