C# The Complete Guide From beginner to advanced. Scratch

What is . NET & C#

C# Program Structure

Variables, Constants, and Literals

Data Types → Value Types vs Reference Types

Type Conversion & Casting

Operators in C# (Arithmetic, Logical, Comparison, Bitwise, Ternary)

Conditional Statements → if, else if, switch

Loops → for, while, do-while, foreach

Jump Statements → break, continue, return

var, dynamic, and object differences

Class, Object, Constructor, and Destructor

Access Modifiers (public, private, protected, internal)

Fields vs Properties

Encapsulation

Inheritance & Polymorphism (Method Overloading, Method Overriding)

Abstraction (Abstract classes, Interfaces)

Sealed classes and methods

Static members

Partial classes

Records vs Classes (C# 9+)

Structs, Enums, and Tuples

Nullable Reference Types (string?)

Anonymous types and var usage

Delegates and Events

Lambda Expressions

Func, Action, Predicate

Generic Classes and Methods

Extension Methods

Indexers and Iterators

Exception Handling (try, catch, finally, throw)

Attributes and Reflection

ref, out, and in parameters

Arrays and Multidimensional Arrays

List< T >, Dictionary< TKey , T Value >, HashSet < T >, Queue, Stack

IEnumerable, IEnumerator, ICollection, IList, IQueryable

LINQ (Language Integrated Query)

• Query Syntax & Method Syntax

• Filtering, Grouping, Joining, Aggregation

Anonymous & Projection in LINQ (Select, SelectMany)

Reading and Writing Text/CSV/JSON files

Working with System . IO

Directory and File classes

JSON Serialization/Deserialization (System. Text. Json)

XML Serialization

Threads & Thread Safety

async and await

Task and Task<T>

Parallel Programming (TPL)

CancellationToken

Locking and Synchronization (lock, Monitor, SemaphoreSlim)

.NET Runtime (CLR), CTS, CLS

Assemblies and Metadata

Namespaces

Garbage Collection

NuGet Packages

Debugging & Logging