C# Quiz — 7 Free Questions

Question 1

What is the purpose of the C#'s "?." combined with "??" in a single expression, such as "customer?.Name ?? "Unknown""?

Question 2

What is the key difference between C#'s "List" and "T[]" (array) types?

Question 3

What is the purpose of LINQ's "GroupBy()" extension method?

Question 4

What is the purpose of C#'s "Span" type, introduced to help improve performance in certain scenarios?

Question 5

What is the purpose of C# "string interpolation", such as $"Hello, {name}!"?

Question 6

What is the purpose of C#'s "required" modifier on a property, introduced in C# 11?

Question 7

What is the purpose of LINQ in C#?

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About C#

C# was developed under the internal codename "Cool", short for "C-like Object Oriented Language", by a team at Microsoft led by Anders Hejlsberg, and released publicly alongside the very first version of .NET in 2000. Its arrival came not long after a legal dispute between Microsoft and Sun over Microsoft's modified version of Java, a conflict that helped push Microsoft toward building its own language rather than continuing to rely on someone else's.

C# borrowed Java's strong typing and object-oriented structure but layered in its own modern touches from early on, and the two languages have spent the two decades since leapfrogging each other with new features, each regularly borrowing good ideas the other introduced first. C# was later standardized through ECMA, giving it an open specification independent of Microsoft's own implementation.

One of C#'s more influential contributions was LINQ, introduced in 2007, which let developers query collections of data, arrays, databases, XML, almost anything, using a consistent, readable syntax built directly into the language itself rather than relying on external query strings. Its async and await keywords, introduced a few years later, also proved influential enough that several other major languages eventually adopted very similar patterns for handling asynchronous code.

Beyond traditional enterprise Windows applications, C# found an entirely separate massive audience through game development. It's the primary scripting language for Unity, one of the most widely used game engines in the world, powering everything from small indie games to major mobile hits, which means C# skills are just as relevant to indie game developers as they are to enterprise .NET teams building line-of-business software.

Through Xamarin, and later its successor .NET MAUI, C# also extended into cross-platform mobile development, letting developers write a single C# codebase that compiles down to native iOS and Android apps rather than maintaining two entirely separate native codebases.

Modern C# looks quite different from its early-2000s roots too, having picked up pattern matching, records, and other features over the years that keep it feeling current alongside much newer languages rather than dated by comparison, even as it approaches its own quarter-century mark.

Recent versions of C# have continued pushing the language forward at a steady pace. C# 9 introduced records, a concise way to define simple data-holding types, C# 10 simplified namespace declarations to cut down on indentation, and C# 11 added raw string literals that make embedding things like JSON or regular expressions inside code dramatically cleaner than before.

Microsoft has also pushed C# and .NET further into open development over the past decade, accepting community contributions directly on GitHub and publishing detailed public roadmaps, a significant cultural shift for a language that spent its first ten years developed almost entirely behind closed doors inside Microsoft.

C# and Java remain frequently compared to this day precisely because they started from such similar foundations, and interview questions comparing the two languages' approaches to things like generics, memory management, or asynchronous programming remain a genuinely common way recruiters test whether a candidate understands the underlying concepts rather than just the surface-level syntax of whichever language they happen to have learned first.