.NET Quiz — 7 Free Questions

Question 1

What is the difference between the 'is' and 'as' operators in C#?

Question 2

What is the 'N+1 query problem' in the context of an ORM like EF Core?

Question 3

What distinguishes an integration test from a unit test in a typical .NET test suite?

Question 4

Which C# keyword creates a variable whose type is inferred by the compiler?

Question 5

What is an event in C#, and how does it relate to a delegate?

Question 6

Why does ASP.NET Core Identity store passwords using one-way hashing rather than reversible encryption or plain text?

Question 7

What is a 'record struct' in C#, introduced as a variant of the 'record' feature?

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About .NET

Microsoft first released .NET back in 2002, giving Windows developers a unified, modern platform after years of juggling different tools and inconsistent APIs. C# launched alongside it as .NET's flagship language, designed by Anders Hejlsberg specifically to give the platform a clean, modern alternative to the languages developers were already using.

For its first decade and a half, .NET was tied tightly to Windows, which limited how far it could travel outside the Microsoft ecosystem. That changed dramatically in 2016 with the open-source rewrite that became .NET Core, a ground-up reimplementation built to run on Linux and macOS just as well as Windows. Microsoft then deliberately skipped straight to ".NET 5" in 2020, avoiding "4" entirely so nobody would confuse it with the older .NET Framework 4.x line, and folded the old Framework and Core branches back into one unified release train under the simple name ".NET".

That cross-platform shift paid off in performance too. Modern ASP.NET Core routinely ranks among the fastest web frameworks in independent benchmarks, a dramatic reputation shift from the framework's earlier, heavier years. Companies like Stack Overflow have run enormous traffic loads on relatively modest hardware specifically because of how efficient the underlying runtime became.

.NET's reach has also expanded well beyond traditional web and desktop apps. Blazor lets developers write full web front ends in C# instead of JavaScript, running either on the server or directly in the browser via WebAssembly, while .NET MAUI extends the same C# codebase to build native mobile apps for iOS and Android, evolving out of the earlier Xamarin project Microsoft acquired in 2016.

Today .NET sits under the open governance of the .NET Foundation, with its source code developed in the open on GitHub rather than behind closed doors the way older Microsoft frameworks once were. That openness, combined with a predictable yearly release cycle, has kept a steady stream of new features landing every November.

What keeps .NET genuinely interesting as a quiz topic is just how much it has quietly reinvented itself. A developer who learned .NET in 2010 would barely recognize the fast, open-source, cross-platform framework it has become by today, even though the core language, C#, has stayed recognizably itself the whole way through.

Visual Studio, Microsoft's flagship development environment, grew up alongside .NET and remains one of the most feature-rich IDEs in the industry, though the free, lightweight Visual Studio Code has since become an equally popular choice for .NET developers who want a faster, more minimal editor. Real-world adoption of .NET spans an enormous range of company sizes too, from small internal line-of-business tools at local governments to GoDaddy's hosting infrastructure and Alaska Airlines' booking systems, proof that the platform scales just as comfortably down as it does up.

C# itself has kept pace with the platform's broader evolution, picking up nullable reference types, top-level statements that remove unnecessary boilerplate from small programs, and increasingly concise syntax with nearly every yearly release, all while staying backward compatible enough that code written a decade ago still generally compiles and runs today.

Interviewers and hiring managers in the .NET world also tend to probe a slightly different set of concepts than in other ecosystems, things like the difference between value types and reference types, how garbage collection actually decides when to reclaim memory, and the tradeoffs between synchronous and asynchronous code using async and await, all of which make for genuinely useful quiz material well beyond simple trivia about release dates.