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Mert Özen's blog posts on software development, backend, frontend, and DevOps.

Series

.NET Core Web API 36 Angular 31 JavaScript Basics 19 JavaScript Intermediate 18 JavaScript Advanced 16 TypeScript Basics 14 TypeScript Intermediate 14 TypeScript Advanced 12 Entity Framework Core 28 Dapper 16 Git & GitHub 29 Web Security (OWASP Top 10) 21 LLM Fundamentals 20 C# Fundamentals 20 Object-Oriented Programming in C# 16 C# Collections and Generics 11 LINQ 17 Asynchronous Programming in C# 17 Advanced C# 14 C# Versions 6 Solution Patterns 22

2 posts found #concurrency

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Backend PART 06

Concurrent Work in C# with Task.WhenAll and Task.WhenAny

Async code is not concurrent by itself: awaiting independent work one by one adds the durations up. Starting first and waiting later, getting ordered results with Task.WhenAll, the trap of starting tasks twice with LINQ Select, WhenAll waiting for everyone after a failure, first answer and timeouts with WhenAny, losers that keep running, and processing tasks as they complete.

7 Nov 2026 9 min 7

Backend PART 13

C# Synchronization: lock, Interlocked, SemaphoreSlim and Concurrent Collections

Why sold++ never reaches a million: race conditions and the check-then-act race. The rules of lock and why you can't await inside it, atomic counters and CompareExchange with Interlocked, the SemaphoreSlim pattern for an async cache, ConcurrentDictionary factories that run more than once and the Lazy<T> fix.

7 Nov 2026 11 min 7