Blog

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

Series

.NET Core Web API 36 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

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Backend PART 12

Writing Your Own LINQ Operator: Extension Methods and yield return

Why a LINQ operator is just an extension method; writing lazy, streaming operators with yield return, separating argument validation from the iterator, immediate operators, finally when enumeration is abandoned early, an Expression-based operator for IQueryable and name clashes with the BCL.

7 Nov 2026 13 min 5

Backend PART 07

C# Collection Interfaces: IEnumerable, ICollection, IList and yield return

What IEnumerable, ICollection, IList and the IReadOnly* interfaces promise and what they don't; why an array throws on Add, exposing an internal list safely, choosing parameter types and writing lazy iterators with yield return.

7 Nov 2026 11 min 7