What’s New in .NET 8 & C# 12

In this lesson, you’ll meet one of the coolest features of C# 12: Primary Constructors. Say goodbye to repetitive constructor code and hello to cleaner, faster class definitions — especially for those small data-focused classes we write all the time.

We’ll show you how to use primary constructors in classes (not just records!) to inject parameters directly into the class declaration. You’ll see how it simplifies your code, improves readability, and makes your life easier during both development and interviews.

You’ll also learn:

• The syntax and usage of primary constructors

• When to use them (and when to avoid them)

• How to combine them with properties, methods, and inheritance

• Real interview-style examples and coding demos

By the end of this lesson, you’ll write less code with more clarity — and be able to explain this feature like a senior developer in any technical interview.

? Let’s remove the fluff and write smarter classes — Primary Constructors are here to help!

What if you could build arrays and lists in C# with the same simplicity as JavaScript or Python? With Collection Expressions in C# 12, now you can! ?

In this lesson, you’ll learn how to use the new square-bracket [ ... ] syntax to create arrays, lists, and spans without the boilerplate. No more new List<int> { ... } — just clean, readable, modern code.

We’ll walk through:

• The new collection expression syntax

• How to spread (..) existing collections into new ones

• When this feature saves you time (especially in LINQ and APIs)

• Interview-style questions and hands-on code demos

Whether you're building simple data structures or dynamic UI models, this feature will quickly become one of your favorites.

By the end of this lesson, you’ll write collections faster, reduce noise in your code, and answer any question about collection expressions like a .NET pro.

? Let’s make your collections cooler, cleaner, and interview-ready. No new keywords required!

In this lesson, we explore a tiny change that brings big convenience: Default Parameters in Lambdas — new in C# 12!

Until now, if you wanted default values in lambda expressions, you had to work around it. Not anymore! Now you can write cleaner, shorter lambdas with default arguments just like regular methods.

You’ll learn:

• How to define default values in lambda parameters

• Real examples in LINQ, delegates, and event handlers

• When this improves readability and flexibility

• Interview-style Q&A and code walkthroughs

This lesson is especially useful in modern C# apps with lots of inline logic — whether you're building APIs, UI event handlers, or functional-style workflows.

By the end, you’ll know exactly how (and when) to use this feature in real projects — and how to casually drop it in an interview like, “Oh yeah, that’s just C# 12 default lambda syntax.”

? Let’s make your lambdas leaner, smarter, and smoother — because good developers write less and mean more.

Ever wished you could rename any type — not just namespaces — to make your code cleaner or shorter? Well, wish granted! In this lesson, you’ll unlock the using = aliasing feature of C# 12, which lets you assign easy names to any type, even generics or tuples.

You’ll learn:

• How to create type aliases using using CustomName = Full.Type.Name<T>;

• When aliases help simplify long or ugly type names

• Smart ways to use them in APIs, helpers, and domain models

• Bonus: how to use aliases in interview take-home projects for readability points

We’ll also look at some clever interview-style questions like:

“How do you improve code readability when using complex types repeatedly?”

By the end of this lesson, you’ll be using type aliases like a boss — writing code that’s easier to read, faster to type, and more professional-looking.

? Let’s clean up those long type names and give your fingers a break — your code (and interviewer) will thank you.

Say hello to Inline Arrays, one of the most performance-focused features in C# 12 — and your new best friend when you need speed, safety, and zero allocations. ⚡

In this lesson, you’ll discover how to create fixed-size arrays directly in structs for ultra-efficient memory usage — especially useful in performance-critical apps like gaming, IoT, or high-speed APIs.

You’ll learn:

• How to declare and use inline arrays with [InlineArray(n)]

• Why inline arrays avoid heap allocation (and why that’s awesome)

• Use cases where this outperforms traditional collections

• What to say when interviewers ask, “How would you optimize memory in C#?”

We'll walk through real examples of defining inline arrays, working with spans, and showing how this feature cuts down both memory usage and GC overhead.

By the end of this lesson, you’ll know exactly when to reach for inline arrays — and how to impress interviewers by combining speed with style.

? Let’s get low-level (without getting scary) and master high-performance tricks that make your C# code fly!

Welcome to one of the most powerful features of .NET 8 — Native AOT (Ahead-of-Time Compilation). If you’ve ever wished your app would start instantly and consume less memory… your wish just came true!

In this lesson, you’ll learn how Native AOT compiles your C# app directly to native machine code, skipping the runtime JIT compiler and boosting startup speed like magic. It’s perfect for microservices, console tools, containers — anything that needs to be fast and lightweight.

We’ll cover:

• What Native AOT is (and what it isn’t)

• How to publish your .NET app with Native AOT

• Performance and size comparisons (with live demos!)

• What to say when interviewers ask about optimization or cold-start scenarios

You'll walk away knowing not just how to use it, but when to use it — and how to explain it like a senior developer.

? Let’s compile once, run everywhere, and fly faster than ever — Native AOT is here to make your apps lean and mean!

.NET 8 isn’t just faster — it’s smarter. In this lesson, we explore the behind-the-scenes magic of the JIT (Just-In-Time) compiler and Garbage Collector (GC) improvements that make your apps run smoother, quicker, and more efficiently than ever.

You’ll learn:

• How the JIT in .NET 8 makes better optimization decisions

• Why loop unrolling, devirtualization, and inlining got a boost

• What changed in the GC — especially Gen2 collection improvements and reduced memory pressure

• Real-world examples that show performance before and after .NET 8

• What to say when interviewers ask, “How has .NET 8 improved runtime performance?”

We’ll show you practical ways to benchmark and visualize these improvements using tools like dotnet-counters and BenchmarkDotNet.

By the end of this lesson, you’ll not only understand what’s changed — you’ll know how it benefits your code, how to measure it, and how to confidently bring it up in performance-focused interviews.

? Let’s take a peek under the hood and see how .NET 8 got turbocharged — no tuning required!

Need the flexibility of NoSQL inside your SQL database? In this lesson, we explore one of the most exciting EF Core 8 features: JSON column mapping — where structured objects meet relational power!

You’ll learn:

• How to store and query complex objects directly inside a JSON column

• How to configure owned types with .ToJson() in EF Core 8

• Querying inside JSON fields using LINQ — yes, it works!

• Practical use cases like saving metadata, logs, nested configs, and audit data

• What to say when interviewers ask: “How would you design a flexible data model in EF Core?”

We’ll build a real-world example: a Product entity with nested ProductMetadata stored in a JSON column — no extra tables needed.

By the end of this lesson, you’ll be able to build hybrid models that are relational where you need structure and NoSQL when you want flexibility — all within SQL Server or PostgreSQL.

? Let’s break the rules (safely) and store objects the modern way — welcome to JSON-first EF Core.

In this lesson, we’re cracking one of the most annoying bugs in software development: working with time. Enter: the new TimeProvider in .NET 8 — a clean, testable, flexible way to handle clocks in your apps.

You’ll learn:

• What TimeProvider and FakeTimeProvider are and why they exist

• How to replace DateTime.UtcNow with a testable, mockable alternative

• How to simulate the passage of time (like jumping into the future!)

• Real-world use cases in scheduling, retry policies, and test automation

• What to say when interviewers ask, “How do you test time-dependent logic?”

We’ll walk through live examples where you can freeze time, mock dates, and predict outcomes without relying on unreliable Thread.Sleep() hacks or hardcoded values.

By the end of this lesson, you’ll have full control over the fourth dimension — and your unit tests will finally stop failing randomly on Fridays.

? Let’s take control of time like time-traveling developers — because your tests deserve stability, and your logic deserves flexibility.