C#

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Last Update	09/14/2026
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Section 1: Getting Started

6Lessons ·
- 4: Compiling and Running C# Applications
  
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Section 2: Core Syntax

12Lessons ·
- 8: Type Inference with var
  
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- 12: For and Foreach Loops
  
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- 17: Nullable Reference Types
  
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Section 3: Object-Oriented C#

12Lessons ·
- 19: Classes, Objects, and Constructors
  
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- 21: Interfaces and Default Interface Methods
  
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- 23: Properties, Fields, and Auto-Properties
  
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- 24: Structs vs Classes
  
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- 28: Sealed Classes and Members
  
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- 29: Practice Exercise: Building a Shape Hierarchy with Polymorphism
  
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Section 4: Working with Data

8Lessons ·
- 35: Deferred Execution in LINQ
  
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Section 7: Async Programming

7Lessons ·
- 51: The Task-Based Asynchronous Pattern
  
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- 54: Cancellation Tokens
  
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- 57: Practice Exercise: Building a Concurrent File Downloader
  
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Section 8: More Language Features

8Lessons ·
- 61: Local Functions
  
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Section 11: The .NET Ecosystem

6Lessons ·
- 77: NuGet Package Management
  
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Section 17: Standard Library Deep Dive

7Lessons ·
- 113: Working with TimeSpan
  
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- 114: The Math Class and Numeric Types
  
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- 115: String Methods and StringBuilder
  
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- 116: Regular Expressions in .NET
  
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Section 20: Practical Projects

9Lessons ·
- 129: Building a Console-Based Inventory Manager
  
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- 130: Building a Simple Task Scheduler
  
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- 135: Building a Background Worker Service
  
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Section 22: More Standard Library and Text Processing

5Lessons ·
- 142: Working with StringBuilder for Performance
  
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- 143: Culture-Aware String Comparison
  
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- 145: Working with Big Numbers: BigInteger
  
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Section 26: C# Keywords Reference (Modifiers)

7Lessons ·
- 162: Access Modifiers: public, private, protected, internal
  
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- 163: The abstract and sealed Modifiers
  
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- 166: The virtual and override Modifiers
  
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Section 27: C# Keywords Reference (Statements)

6Lessons ·
- 169: The checked and unchecked Keywords
  
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Section 28: C# Keywords Reference (Operators)

5Lessons ·
- 175: The is and as Operators
  
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- 179: The ?? and ??= Operators Revisited
  
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Section 30: BCL: System.Linq

8Lessons ·
- 186: Select and SelectMany
  
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Section 32: BCL: System.IO

5Lessons ·
- 202: Path Manipulation Utilities
  
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- 203: MemoryStream
  
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Section 33: BCL: System.Text and System.Text.Json

4Lessons ·
- 204: StringBuilder Members In Depth
  
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Section 38: More BCL: System.Reflection and System.Diagnostics

4Lessons ·
- 227: Debug and Trace Classes
  
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Section 39: Nullable Reference Types In Depth

4Lessons ·
- 231: Nullable Attributes: NotNull, MaybeNull
  
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