C# Interview Questions and Answers — Questpond
Channel: Questpond | Views: 1M+ | Published: 2021
Why we recommend it: This is one of the most comprehensive C# interview prep videos available on YouTube, covering 30 essential questions across core topics every .NET developer is expected to know. Questpond walks through fundamentals like the difference between .NET and C#, CLR, IL code, garbage collection, stack vs heap, boxing/unboxing, generics, threading, delegates, events, and abstract classes vs interfaces — all in a single sitting. It’s structured as a multi-part series so you can jump directly to the topic you need to brush up on. Ideal for junior to mid-level developers preparing for their first or second .NET role.
Topics covered: .NET vs C#, CLR, JIT, IL Code, Garbage Collection, Stack vs Heap, Value vs Reference Types, Boxing/Unboxing, Generics, Threading, TPL, Delegates, Events, Abstract Class vs Interface
OOP Interview Questions and Answers — Questpond
Channel: Questpond | Views: 822K+ | Published: 2022
Why we recommend it: Object-Oriented Programming questions are almost guaranteed to come up in any .NET interview, and this one-hour video covers them thoroughly and clearly. Questpond works through 27 questions spanning all four OOP pillars — abstraction, encapsulation, inheritance, and polymorphism — plus deeper topics like abstract classes vs interfaces, operator overloading, the Interface Segregation Principle, and multiple inheritance. What makes this video stand out is that it doesn’t just define concepts — it explains why they exist, which is exactly what interviewers are probing for. A must-watch before any mid-level or senior .NET interview.
Topics covered: OOP Pillars, Class & Object, Abstraction vs Encapsulation, Inheritance, Virtual & Override, Overloading vs Overriding, Polymorphism, Abstract Classes, Interfaces, Interface Segregation Principle, Multiple Inheritance
Software Architecture and Design Patterns Interview Questions — Questpond
Channel: Questpond | Views: 207K+ | Published: 2024
Why we recommend it: Architecture and design pattern questions are where junior-to-mid developers often struggle most in interviews — and this video tackles them head on. At 1.5 hours, it’s the most in-depth of the Questpond series, covering everything from how to confidently explain your own project architecture, to the differences between architecture styles, architecture patterns, and design patterns (a distinction many candidates get wrong). The Singleton deep-dive alone — covering thread safety, double null check, and the Lazy keyword — is worth the watch. The second half compares MVC, MVP, and MVVM side by side, which is essential for any .NET developer working on UI-heavy applications. Senior candidates especially will find this useful for the “explain your project architecture” question that opens most experienced-level interviews.
Topics covered: Architecture Style vs Pattern vs Design Pattern, Singleton Pattern, Thread-Safe Singleton, Static vs Singleton, MVC vs MVP vs MVVM, ViewModel, Separation of Concerns, Layered vs Tiered Architecture, Design Pattern Types
SQL Server Interview Questions and Answers — Questpond
Channel: Questpond | Views: 793K+ | Published: 2021
Why we recommend it: SQL is tested in virtually every .NET developer interview, and this video covers it more comprehensively than almost anything else on YouTube — 53 questions across 5 parts. It starts with the fundamentals every candidate must know (normalization, indexes, joins, stored procedures, triggers) and progressively moves into trickier territory like correlated subqueries, the classic “find the Nth highest salary” problem, and performance comparisons between different query approaches. The clustered vs non-clustered index explanation and the joins deep-dive are particularly clear. If you’re applying for a role that involves any data access layer work — which is most .NET roles — this is essential viewing.
Topics covered: Normalization, OLTP vs OLAP, Primary vs Unique Key, Clustered vs Non-Clustered Index, Stored Procedures vs Functions, Triggers, Transactions, All Join Types, Union vs Union All, Group By, Having Clause, Subqueries, Correlated Queries, Nth Highest Salary
Preparing for a .NET developer interview can feel overwhelming —
there’s C# fundamentals, OOP principles, async programming,
Entity Framework, system design, and data structures all on the table.
The good news? Some of the best .NET educators on YouTube have already
done the hard work of breaking these topics down clearly. This list
is a hand-picked collection of videos the MauiTutorials team has
personally watched and found genuinely useful — whether you’re
landing your first dev job or stepping up to a senior role.
Interview prep is a marathon, not a sprint. Bookmark this page and
work through one section at a time rather than binge-watching everything
at once. If you found this list helpful, check out our other
.NET deep-dive tutorials — the same concepts covered in these videos
come up constantly in real-world .NET development too.
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