C# and .NET Learning Roadmap ✅

A complete roadmap to learn C# programming and .NET development from beginner to advanced level.
This repository is designed to help anyone searching for a:

• 🚀 C# Roadmap
• 💻 .NET Roadmap
• 📘 C# Learning Path
• 🧠 C# Study Guide

📦 Covers: Basics → OOP → Collections → LINQ → Generics → ASP.NET Core → Entity Framework → Clean Architecture

This guide is structured as a Markdown checklist and updated regularly as I learn.

---

1: C# Foundations

1.1 Input / Output processing & Variables.

Console.Write("What is your name?"); // With newline
string name = Console.ReadLine();
Console.WriteLine(name);

1.2 Understand Predefined Types

• Value Types (int, float, char, etc.)
• Reference Types (string, object)

1.3 Type Conversions

string input = "123";
int number = Convert.ToInt32(input);
double d = Convert.ToDouble("3.14");
bool b = Convert.ToBoolean("true");

1.4 Nullable types

int? number = null;
int result = number ?? 0;

1.5 Control Flow Statements

• if-else
• switch
• Loops
  • for
  • foreach
  • while
  • do-while

1.6 Error Handling

• try-catch-finally
• Other Statements
  • using
  • lock
  • unsafe
  • yield

1.7 Operators

• Arithmetic
• Assignment
• Relational
• Bitwise
• Overflow/Underflow (checked/unchecked)

---

2: OOP in C#

• Classes and Objects

• Constructor, Destructor/Finalizer

• Inheritance

• Polymorphism (compile time & run time)

• this & base keyword

• Fields (static, instance, readonly)

• Field, properties & Auto properties: { get; set; }

• Access Modifiers (public, private, protected, internal, protected internal, private protected)

• Storage & Behavior Modifiers (static, const, required, readonly, volatile, unsafe)

• Methods (static, instance, override, abstract, virtual)

• Method Overloading

• Method Override

• Constructors (static, instance)

• Constructor chaining

• Static Class

• Partial Class & Partial Methods

• Abstract Class

• Structs

• Enums

• Interfaces and Delegates

• Namespaces

• Using Generics

  • Generic Class, Constraints and Generic Method
  • Built in Generic data structures (List, Dictionary<K,V>, Queue, Stack, HashSet, SortedList<K,V>, SortedDictionary<K,V>)
  • Concurrent Collections (for multithreading) (ConcurrentDictionary<K,V>,ConcurrentQueue, ConcurrentStack, BlockingCollection)
  • Non-generics collection

---

3: Collections and Data Structures

• Generic Collections (System.Collections.Generic)
  • List
  • Dictionary<TKey, TValue>
  • Queue
  • Stack
  • HashSet
  • LinkedList
• Non-generic Collections
  • ArrayList
  • Hashtable
  • SortedList
  • Stack
  • Queue
• Arrays
  • Single-dimensional Arrays
  • Multi-dimensional Arrays

---

4: Exception Handling

• try, catch, finally
• Custom Exceptions
• throw keyword
• Exception filters

---

5: LINQ (Language Integrated Query)

• Basic LINQ Concepts
  • Select
  • Where
  • OrderBy
  • GroupBy
• Aggregation & Set Operations
  • Sum
  • Count
  • Min/Max
  • Intersect
  • Union
  • Except
• Element Operators
  • First
  • Last
  • Single
  • ElementAt
• Filtering and Conversion
  • OfType
  • Cast
  • ToList
  • ToArray
  • ToDictionary
• LINQ Projection & Quantification
  • SelectMany
  • All
  • Any
  • Contains
• yield return

---

6: Advanced Concepts

• Lambda Expressions
• Delegates
• Events
• Extension Methods
• Anonymous Methods
• ref, out, in keyword
• params keyword
• Nullable reference types (?, ??, ??=, ?.)
• Pattern Matching (with is, switch, etc.)

---

7. Multithreading and Asynchronous Programming

• async / await
• Tasks and Task
• Threads
• Thread.Sleep, Task.Delay
• lock keyword
• Parallel.For, Parallel LINQ (PLINQ)
• CancellationToken

---

8. Reflection & Attributes

• System.Reflection
• Reading metadata
• Custom Attributes
• typeof, GetType()

---

9. Memory Management

• Value Types vs Reference Types
• Stack vs Heap
• Garbage Collection
• IDisposable and using statement
• Finalizers

---

10. Miscellaneous

• Tuples
• Records (C# 9+)
• Dynamic Type
• var, dynamic, object differences
• enum and struct
• nameof operator
• Top-level statements (C# 9+)

---

11. File I/O and Serialization

• Reading/Writing Files (System.IO)
• StreamReader / StreamWriter
• Binary and XML Serialization
• JSON Serialization (System.Text.Json, Newtonsoft.Json)

---

2 .NET Topics

2.1 .NET Fundamentals

• What is .NET / .NET Core / .NET 5/6/7/8?
• CLR (Common Language Runtime)
• CTS, CLS (Common Type System, Common Language Specification)
• Project Types: Console App, Class Library, ASP.NET Web App
• Solution (.sln) and Project (.csproj) files
• Understanding the build and run lifecycle

2.2 Working with Projects

• Creating and running projects with dotnet CLI
• Adding NuGet packages (dotnet add package)
• appsettings.json configuration
• Environments (Development, Production, etc.)

2.3 ASP.NET Core Web Applications

• MVC Pattern (Model-View-Controller)
• Razor Views & Razor Pages
• Middleware and Request Pipeline
• Routing and Endpoints
• Static Files and Hosting

2.4 Web APIs with ASP.NET Core

• Creating RESTful APIs with Controllers
• Attribute Routing ([HttpGet], [HttpPost])
• Model Binding and Validation ([FromBody], ModelState)
• JSON Serialization (System.Text.Json)
• Swagger/OpenAPI Integration

2.5 Dependency Injection (DI)

• Constructor Injection
• AddTransient, AddScoped, AddSingleton
• Registering and Resolving Services

2.6 Configuration and Settings

• IConfiguration and IOptions
• Reading from appsettings.json, environment variables
• Strongly Typed Configuration

3. Advanced .NET Topics

3.1 Entity Framework Core (EF Core)

• Code First vs Database First
• DbContext and DbSet
• Migrations (Add-Migration, Update-Database)
• Relationships (1:1, 1:N, M:N)
• LINQ with EF
• Eager vs Lazy Loading
• Raw SQL Queries

3.2 Authentication & Authorization

• ASP.NET Core Identity
• OAuth
• Identity Server
• Access Mechanism
• Role-Based and Policy-Based Authorization
• JWT Authentication
• Custom Authentication Handlers
• Claims and Identity Management

3.3 Middleware and Filters

• Creating Custom Middleware
• Exception Handling Middleware
• Action Filters, Result Filters

3.4 Logging and Monitoring

• ILogger
• Logging providers: Console, Debug, File, Serilog
• Application Insights

3.5 Hosting and Deployment

• Kestrel Web Server
• IIS Integration
• Publishing with dotnet publish
• Dockerizing .NET Apps
• CI/CD basics with GitHub Actions, Azure DevOps, etc.

3.6 Testing

• Unit Testing with xUnit / NUnit / MSTest
• Mocking with Moq
• Integration Testing (TestServer)
• Testing EF Core

3.7 Advanced Web API Topics

• API Versioning
• Rate Limiting
• Throttling
• Caching (In-memory, Distributed)
• Uploading/Downloading files in APIs

3.8 Bonus: Architecture & Design Patterns in .NET

• Clean Architecture / Onion Architecture
• Repository and Unit of Work Patterns
• CQRS & Mediator Pattern
• SOLID Principles
• Minimal APIs (introduced in .NET 6)