.NET Interview Questions: The 2026 Guide (300+ Real Questions)
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A comprehensive .NET interview preparation guide covering 20 scenario-based questions across C#, async/multithreading, LINQ, ASP.NET Core, EF Core, system design, and architecture. Each question includes a model answer, a red-flag answer to avoid, and common follow-up questions. Topics range from records vs classes and boxing to captive dependencies, N+1 queries, cache stampedes, idempotent payment APIs, and graceful Kubernetes shutdown. The guide also outlines the typical four-round interview structure and five common mistakes that get candidates rejected, with everything updated for .NET 10 and C# 14.
Table of contents
How .NET Interviews Actually Run in 2026The .NET Interview Questions ClusterC# Language QuestionsAsync and Multithreading QuestionsLINQ QuestionsASP.NET Core QuestionsMiddlewares in ASP.NET Core - The Complete GuideTransient vs Scoped vs Singleton in .NETEF Core Questions30 EF Core Interview Questions That Actually Get Asked in 2026System Design QuestionsArchitecture and Judgment QuestionsPerformance and Caching QuestionsTesting and Production QuestionsWeb API Questions45 .NET Web API Interview Questions That Actually Get Asked in 20265 Interview Mistakes That Get .NET Developers RejectedKey TakeawaysInterview Questions PDF2.7K Impressions