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🎓 Welcome to Intermediate C#

Take your C# from "I can write programs" to "I can build real, robust applications." This course builds directly on Introduction to C#, covering the tools and techniques professional developers use every day.

📚 About This Course

You already know variables, control flow, methods, collections, and object-oriented programming — including inheritance, interfaces, and polymorphism. This course picks up exactly where Introduction to C# left off and turns that foundation into practical, real-world skill.

You'll learn to handle errors gracefully, write reusable generic code, query data elegantly with LINQ, use modern C# language features, work with files and JSON, write asynchronous code, call web APIs, and test what you build — finishing with a capstone that pulls it all together.

What You'll Learn

  • Handle failures gracefully with exceptions, and write type-safe reusable code with generics
  • Choose and use the right collection: dictionaries, sets, queues, and stacks
  • Pass behavior around with delegates and lambdas, and react to events
  • Query and transform data expressively with LINQ
  • Write concise, null-safe code with records, pattern matching, and nullable reference types
  • Read and write files, and serialize objects to and from JSON
  • Keep applications responsive with async/await
  • Call web APIs with HttpClient and write unit tests for your code
  • Combine everything into a complete, well-structured application

Who This Course Is For

  • Learners who finished Introduction to C# (or equivalent)
  • Developers comfortable with C# basics and OOP who want practical, job-ready skills
  • Anyone ready to move from writing small programs to building real applications

📖 Course Modules

Module 1: Writing Robust Code

Handle failures gracefully and write reusable, type-safe code.

Module 2: Functional-Style C#

Pass behavior around with delegates, react to events, and query data with LINQ.

Module 3: Modern Language Features

Write concise, expressive, null-safe C# with records, pattern matching, and nullable reference types.

Module 4: Data and I/O

Read and write files, serialize to JSON, and keep apps responsive with async.

Module 5: Real-World C# and Quality

Call web APIs, test your code, and build a complete application.

✅ Prerequisites

Before starting this course, you should be comfortable with:

  • C# fundamentals: variables, data types, operators, and console I/O
  • Control flow (if/switch, loops) and writing methods
  • Collections (arrays and List<T>)
  • Object-oriented programming: classes, objects, inheritance, interfaces, and polymorphism

All of this is covered in Introduction to C# — if any of it feels shaky, review it first.

Required Software

  • The .NET SDK (same setup as the intro course)
  • A code editor: VS Code with the C# Dev Kit, or Visual Studio

📚 Additional Resources

Official Documentation

Useful Links

Support

If you have questions or need help:

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