C# Basics

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Table of Contents

L1: Fundamental (Entry-Level / Junior)

Focus: Syntax, basic language constructs, and core type system.

• Fundamentals: Data types, variables, type system, and basic C# syntax.
• Operators: Arithmetic, comparison, logical, bitwise, and null-coalescing operators.
• Control Flow: Conditional statements (if/else, switch expressions) and loops (for, foreach, while).

L2: Intermediate (Junior-Mid / Developer)

Focus: Object-oriented programming, collections, and common language features.

• Classes and Structs: Fields, properties, constructors, methods, access modifiers, and records.
• Inheritance and OOP: Base/derived classes, abstract classes, interfaces, and polymorphism.
• Collections and Generics: List, Dictionary, HashSet, Stack, Queue, and IEnumerable.
• File Handling: StreamReader/Writer, File, Path, and Directory APIs.
• Regular Expression: Regex patterns, matching, groups, and replacements.
• Exception Handling: try/catch/finally, custom exceptions, and best practices.

L3: Advanced (Mid-Senior / Lead)

Focus: Concurrency, memory management, and advanced language features.

• Delegates and Events: Delegates, multicast delegates, events, and EventHandler patterns.
• Lambda Expressions: Func, Action, Predicate, expression trees, and closures.
• Language Integrated Query (LINQ): LINQ operators, deferred execution, query syntax, and method chaining.
• Asynchronous Programming and Multithreading: Thread, Task, async/await, Parallel, and synchronization primitives.
• Memory Management and Garbage Collection: GC generations, IDisposable, finalizers, and memory pressure.

L4: Expert (Senior / Architect)

Focus: Architecture, scalability, performance, and deployment strategies.

• Advanced C# Features: Reflection, source generators, unsafe code, and dynamic programming.
• Performance and Optimization: Span<T>, Memory<T>, object pooling, benchmarking, and profiling.
• Microservices and Distributed Systems: Service decomposition, gRPC, message brokers, and distributed patterns.
• Architecture and Design Patterns: Clean Architecture, CQRS, DDD, and enterprise integration patterns.
• Deployment: CI/CD pipelines, containerization, publishing profiles, and environment config.
• .NET Core: Middleware, DI container, configuration, hosted services, and ASP.NET Core internals.
• Miscellaneous: Reflection, attributes, source generators, and advanced C# patterns.

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