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Free .NET interview kit
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Pass your .NET interview.

250 questions with answers, clean C# code, and full complexity analysis - completely free.

Updated to .NET 10 - now with Lists & Trees sections
0

Interview Questions

0

Topic Categories

2–3

Solutions Per Problem

.NET 10

Framework

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✓Arrays, Lists & Trees✓General .NET / C# / SQL✓Junior → Mid-Senior
Or practice interactively — solve problems in your browser →Write C#, run it against live tests, reveal the optimal solution. No signup.
What's inside

250 questions across 4 categories

Every coding question includes 2–3 solutions, time & space complexity, edge-case discussion, and clean C# code ready to run.

📦Arrays - 20 Questions

Reversal, rotation, searching, frequency counting, duplicates, subarray problems (Kadane's, max product), binary search, sorting, and shuffling.

2–3 solutions per problemBrute force → optimalBig-O analysis included
NEW

📋Lists - 20 Questions

Duplicates, sorting, reversing, merging, splitting, flattening, searching, frequency counting, contiguous sums, and equality comparison.

List<T> focusedLINQ integrationReal-world patterns
NEW

🌳Trees - 20 Questions

DFS & BFS traversals, depth/balance/symmetry checks, BST operations (insert, search, validate), path sums, diameter, LCA, and serialize/deserialize.

Recursive thinkingDivide & conquerTreeNode model included

💡General .NET / C# / SQL - 70 Questions

Language fundamentals, async/await, SOLID, DI, middleware, EF, MVC, Blazor, SignalR, unit testing, CI/CD, JOINs, indexes, normalization, and more.

Basic → AdvancedCode examplesSQL section included
Short on time?

Top questions interviewers actually ask

Based on real interviews - focus on these first.

›Reverse & Rotate arrays›Remove Duplicates›Max Subarray Sum (Kadane's)›DFS / BFS Traversals›Validate BST›async/await & SOLID principles›Value vs Reference types›Dependency Injection›SQL JOINs & Indexes›Unit Testing & Mocking
Bonus

You also get these

🎁Design Patterns Interview Questions Ebook

•100+ questions with answers (20 pages)

•Code-based questions

•Dark and Light mode PDF

🎁The Job-Seeking .NET Developer's LinkedIn Handbook

•Short ebook with ready-to-start actions

•Real examples, checklists & tools

•Casual, recruiter-friendly language

Who is this for?

✓Junior to mid-senior .NET developers preparing for interviews

✓Developers brushing up on data structures & algorithms in C#

✓Anyone who wants structured, practical interview prep - not just theory

Walk in prepared. Walk out hired.

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