Language Basics

Fundamentals of C# syntax, type system, and control flow. The first stop for beginners to grasp the logic of the language.

Language Basics

For anyone starting with C#, this section covers syntax, basic data types, operators, conditional statements, and loops. Exception handling and the concept of namespaces are also included as the building blocks every developer must know.

Goal: Learn syntax and control flow to prepare for more advanced concepts.

TL;DR

if, switch, for, foreach structures.
Basic types: int, string, bool.
Error handling: try/catch/finally.

Introduction to C# and the .NET Ecosystem

11 January 2026 • Language Basics

C# is a modern, safe, and object-oriented language. With the .NET ecosystem, it is possible to develop web, mobile, desktop, and game applications.

C# C# Basics

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First C# Project

11 January 2026 • Language Basics

First console app in C# with Visual Studio 2022: usage of WriteLine, ReadKey, and ReadLine.

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C# Basic Data Types

11 January 2026 • Language Basics

Basic data types in C#: numeric, text, logical, object-based, and nullable types.

C# C# Basics Variables

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C# Syntax Structure

13 January 2026 • Language Basics

Learn the basics of C# syntax, including code blocks, comments, and variable naming rules, with clear explanations and practical examples.

C# Syntax

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C# Operators and Expressions

13 January 2026 • Language Basics

Operators and expressions in C#: arithmetic, comparison, logical, increment/decrement, ternary, and null-coalescing usage.

C# Operators

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C# Conditional Statements (if, else, switch)

13 January 2026 • Language Basics

Decision structures in C#: learn how to use if, else if, else and switch to perform different actions based on conditions.

C# else Statement if Statement switch Statement

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C# Loops (for, foreach, while, do-while)

17 January 2026 • Language Basics

Learn how to use for, foreach, while, and do-while loops in C#. Discover practical examples for handling repeated operations in C# applications.

C# do-while Loop for Loop foreach Loop while Loop

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C# Console Commands

17 January 2026 • Language Basics

Learn how to work with the C# console by writing output, reading user input, and formatting text with practical examples.

C# Console

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C# String Operations

17 January 2026 • Language Basics

Learn how to work with strings in C#, including concatenation, searching, substring, IndexOf, and other essential string operations.

C# String Operations

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C# Type Conversions

21 January 2026 • Language Basics

Learn how type conversions work in C#, including implicit and explicit casting, Parse, TryParse, and Convert methods with examples.

C# Type Conversion

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Using Constants and Enums in C#

21 January 2026 • Language Basics

Learn how to use constants and enums in C# to write cleaner, safer, and more maintainable code with clear explanations and examples.

C# Constants Enum

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C# Math Library

21 January 2026 • Language Basics

Learn how to use the C# Math library, including Pow, Sqrt, Round, Abs, and other essential mathematical methods with examples.

C# C# Math

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C# Boolean Operations

24 January 2026 • Language Basics

Learn how boolean operations work in C#, including the bool type, comparisons, and logical operators like &&, ||, and ! with examples.

Boolean C#

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DateTime & TimeSpan Operations in C#

24 January 2026 • Language Basics

Learn how to work with DateTime and TimeSpan in C# to perform date and time operations such as comparison, addition, subtraction, and formatting.

C# DateTime

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Random Operations in C#

27 January 2026 • Language Basics

Learn how to use the Random class in C# to generate random numbers, values, and selections using Next, NextDouble, and examples.

C# Random

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Methods and Parameter Usage in C#

27 January 2026 • Language Basics

Learn how to define methods and use parameters in C#, including value and reference parameters, optional parameters, and examples.

C# Methods Parameters

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C# Exception Handling (try, catch, finally)

30 January 2026 • Language Basics

Learn how to handle exceptions in C# using try, catch, and finally blocks to manage errors safely with clear examples.

C# Error Handling try-catch

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Namespaces and Assemblies in C#

30 January 2026 • Language Basics

Learn how namespaces and assemblies work in C# to organize code, manage dependencies, and structure projects effectively.

C# C# Namespace

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In C#, nameof() returns the name of a variable, property, or method as text. This helps prevent errors caused by hard-coded strings.


int age = 25;

// Old approach
if (age < 0)
{
    throw new ArgumentException("age");
}

// Recommended approach
if (age < 0)
{
    throw new ArgumentException(nameof(age));
}

Console.WriteLine(nameof(age)); // age

In C#, the ??= operator assigns a value only when the variable has no value (null). If the variable already has a value, it stays the same.


string? title = null;

// If title has no value, a value is assigned
title ??= "Untitled";
Console.WriteLine(title); // Untitled

// Since title already has a value, nothing changes
title ??= "New Title";
Console.WriteLine(title); // Untitled

In C#, use TryParse instead of Parse when converting user input or external data to prevent runtime errors.


// Risky usage
int age = int.Parse(input);

// Safe usage
if (int.TryParse(input, out int result))
{
    Console.WriteLine(result);
}
else
{
    Console.WriteLine("Invalid number");
}

In C#, the ?. operator allows you to safely access a property or method. If the object has no value (null), the result is also null and no error occurs.


Person? person = null;

// Old approach
string name1 = person != null ? person.Name : null;

// Recommended approach
string? name2 = person?.Name;

Console.WriteLine(name1); // null
Console.WriteLine(name2); // null

In C#, modifying a collection inside a foreach loop causes runtime errors. If you need to change the collection, iterate over a copy or use a different loop.


// This will cause an error
foreach (var item in items)
{
    items.Remove(item);
}

// Safe approach: iterate over a copy
foreach (var item in items.ToList())
{
    items.Remove(item);
}

// Alternative: use for loop
for (int i = items.Count - 1; i >= 0; i--)
{
    items.RemoveAt(i);
}