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Aporeon

Technical interview practice, from one developer to another.

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.NET Full Stack

C# and .NET

C# language behavior, .NET runtime concepts, async flow, and production-level .NET interview topics.

12 drillsPractice one at a timeOrdered pathComparison questionConcept questionDebugging scenarioArchitecture scenario

Recommended start

Time modeling in .NET

Distinguishes instants, local calendar values, offsets, and named time zones so APIs and persistence survive daylight-saving and locale boundaries.

Medium~7 minStep 1 of 12

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1Time modeling in .NETRecommended startDistinguishes instants, local calendar values, offsets, and named time zones so APIs and persistence survive daylight-saving and locale boundaries.Comparison questionMedium~7 min.NETC#SQL ServerPractice 2Value and reference semanticsExplains what is copied when values and object references are assigned or passed, including the explicit effect of ref, out, and in.Concept questionEasy~5 min.NETC#Practice 3Mutable structs and copiesDiagnoses lost struct mutations and explains how readonly access can trigger defensive copies.Debugging scenarioMedium~10 min.NETC#Practice 4Boxing and structsExplains when a value is wrapped as an object, why unboxing is exact, and how generic APIs can avoid hidden allocations.Concept questionMedium~7 min.NETC#Practice 5Generic constraints and varianceUses constraints to express required operations and explains safe assignment direction for generic producers and consumers.Comparison questionHard~9 min.NETC#Practice 6Delegates and eventsDistinguishes callable delegate values from publisher-controlled events and makes subscription lifetime explicit.Comparison questionMedium~7 min.NETC#Practice 7Nullable reference boundariesUses nullable annotations as a compile-time contract while still validating untrusted and legacy runtime inputs.Architecture scenarioMedium~10 min.NETC#Practice 8Exception handling boundariesPreserves failure context, catches only where recovery or translation is possible, and uses filters without hiding unrelated faults.Architecture scenarioHard~12 min.NETC#Practice 9Reflection and AOTUses metadata-driven behavior deliberately and protects reflection-dependent code when publishing with trimming or ahead-of-time compilation.Architecture scenarioHard~12 min.NETC#Practice 10Closures and captured stateExplains what a lambda captures, how captured state is shared, and why a long-lived callback can retain more memory than expected.Debugging scenarioMedium~10 min.NETC#Practice 11Pattern matching decisionsUses type, property, relational, and list patterns to express decisions while keeping null and unhandled cases explicit.Architecture scenarioMedium~10 min.NETC#Practice 12Extension method resolutionExplains static extension binding, instance-member precedence, namespace ambiguity, null receivers, and compatibility when APIs evolve.Concept questionHard~9 min.NETC#Practice

Practice order

12 drillsOne at a time

1Time modeling in .NETUp next / Medium / ~7 min
2Value and reference semanticsEasy / ~5 min
3Mutable structs and copiesMedium / ~10 min
4Boxing and structsMedium / ~7 min
5Generic constraints and varianceHard / ~9 min
6Delegates and eventsMedium / ~7 min
7Nullable reference boundariesMedium / ~10 min
8Exception handling boundariesHard / ~12 min

+4 more drills in this section