C# Tutorial - Textnotes

C# Tutorial

C# Tutorial

Chapter 1: Introduction to C#

  1. What is C#?
  2. History & Evolution of C#
  3. Features of C#
  4. .NET Framework vs .NET Core vs .NET 5/6/7/8
  5. Applications of C# (Web, Desktop, Mobile, Games)
  6. Setting up Environment (Visual Studio / VS Code)
  7. Your First Program: Hello World


Chapter 2: C# Basics

  1. Structure of a C# Program
  2. Variables & Data Types (int, float, double, char, string, bool)
  3. Constants & Readonly
  4. Keywords in C#
  5. Comments (single-line, multi-line, XML comments)
  6. Operators:
  7. Arithmetic (+, -, *, /, %)
  8. Assignment (=, +=, -=)
  9. Comparison (==, !=, >, <, >=, <=)
  10. Logical (&&, ||, !)
  11. Bitwise (&, |, ^, <<, >>)


Chapter 3: Control Statements

  1. Conditional Statements:
  2. if, else if, else
  3. switch statement
  4. Loops:
  5. for, while, do while
  6. foreach
  7. Jump Statements: break, continue, return, goto


Chapter 4: Methods

  1. Defining and calling methods
  2. Method parameters and return types
  3. Method Overloading
  4. Optional Parameters
  5. ref, out, params keywords
  6. Recursion


Chapter 5: Object-Oriented Programming (OOP)

  1. Classes & Objects
  2. Constructors (Default, Parameterized, Static)
  3. Fields & Properties
  4. Encapsulation (Getters & Setters)
  5. Inheritance (Single, Multilevel)
  6. Polymorphism (Method Overloading & Overriding)
  7. Abstraction (Abstract Classes)
  8. Interfaces
  9. Sealed Classes
  10. Static Classes & Members
  11. this keyword


Chapter 6: Arrays & Collections

  1. Arrays:
  2. One-dimensional
  3. Multi-dimensional
  4. Jagged arrays
  5. Collections:
  6. List<T>
  7. Dictionary<TKey, TValue>
  8. HashSet<T>
  9. Queue<T>, Stack<T>
  10. ArrayList & Hashtable (Legacy)
  11. LINQ with Collections


Chapter 7: Strings & StringBuilder

  1. String Manipulation
  2. String Methods (Length, Substring, IndexOf, Replace, etc.)
  3. String Interpolation
  4. StringBuilder class
  5. Comparing strings
  6. Formatting strings


Chapter 8: Exception Handling

  1. try, catch, finally
  2. throw keyword
  3. Creating custom exceptions
  4. Common Exception Types (NullReferenceException, IndexOutOfRangeException, etc.)
  5. Best Practices


Chapter 9: File Handling

  1. Reading & Writing Files (Text, CSV)
  2. FileStream, StreamReader, StreamWriter
  3. Directory operations
  4. JSON Serialization & Deserialization (System.Text.Json)
  5. Binary files


Chapter 10: Advanced C# Concepts

  1. Generics
  2. Delegates
  3. Events
  4. Lambda Expressions
  5. Anonymous Methods
  6. Extension Methods
  7. Indexers
  8. Nullable types
  9. Tuples


Chapter 11: LINQ

  1. What is LINQ?
  2. LINQ to Objects
  3. LINQ to SQL
  4. LINQ Queries (Where, Select, OrderBy, GroupBy, Join)
  5. Lambda Expressions with LINQ
  6. LINQ with Collections and Arrays


Chapter 12: Asynchronous Programming

  1. Async & Await
  2. Task Parallel Library (TPL)
  3. Multi-threading in C#
  4. Thread vs ThreadPool
  5. Cancellation Tokens
  6. BackgroundWorker


Chapter 13: C# with Databases

  1. ADO.NET Overview
  2. SqlConnection, SqlCommand, SqlDataReader, SqlDataAdapter
  3. Parameters and Stored Procedures
  4. Transactions
  5. Entity Framework Core
  6. CRUD Operations with EF Core
  7. LINQ with EF Core


Chapter 14: C# Web Development

  1. Introduction to ASP.NET Core
  2. MVC Architecture
  3. Controllers, Views, Models
  4. Routing
  5. Middleware
  6. Dependency Injection
  7. REST API Development
  8. Authentication & Authorization (Identity Framework, JWT)
  9. Razor Pages


Chapter 15: Desktop App Development

  1. WinForms Basics:
  2. Controls, Events
  3. Forms & Dialogs
  4. Database Connectivity
  5. WPF Basics:
  6. XAML Introduction
  7. Data Binding
  8. MVVM Pattern
  9. Commands & Events


Chapter 16: Mobile App Development

  1. .NET MAUI Basics
  2. Creating Pages
  3. Navigation
  4. UI Controls
  5. SQLite Local Database
  6. API Integration


Chapter 17: Game Development (Optional)

  1. Unity with C#
  2. Scripts & Components
  3. Game Objects
  4. Animations
  5. Event Handling in Games


Chapter 18: C# Design Patterns & Best Practices

  1. Singleton
  2. Factory
  3. Repository
  4. Dependency Injection
  5. SOLID Principles
  6. Code Optimization Tips


Chapter 19: Real-World Projects

  1. Student Management System
  2. Inventory System
  3. Billing System
  4. Employee Management System
  5. REST API with JWT Authentication
  6. WPF Dashboard
  7. SignalR Chat Application


Chapter 20: Interview Preparation

  1. C# Basics Questions
  2. OOP Questions
  3. ASP.NET Core Questions
  4. LINQ & EF Core Questions
  5. Multi-threading & Async Questions
  6. Database Connectivity Questions
  7. Design Patterns & Best Practices Questions