C# tutorials

What is the difference between `List<T>`, `ArrayList`, and `LinkedList<T>`?

This tutorial explores the key differences between `List`, `ArrayList`, and `LinkedList` in C#. Understanding these differences is crucial for choosing the right data structure for optimal performance...

C# tutorials Core C# Fundamentals

GraphQL libraries (.NET GraphQL)

This tutorial explores GraphQL libraries in .NET, focusing on GraphQL.NET, a popular and powerful library for building GraphQL APIs. We'll cover basic setup, defining schemas, writing resolvers, and...

C# tutorials Frameworks and Libraries

How do you create and manage multiple tasks (`Task.WhenAll()`, `Task.WhenAny()`)?

This tutorial explores how to create and manage multiple asynchronous tasks in C# using `Task.WhenAll()` and `Task.WhenAny()`. These methods are essential for efficient parallel processing and...

C# tutorials Asynchronous Programming

Relationships (one-to-one, one-to-many, many-to-many, fluent API configuration)

Understanding Relationships in Entity Framework Core This tutorial explores how to define and manage relationships between entities in Entity Framework Core (EF Core). We will cover one-to-one,...

C# tutorials Frameworks and Libraries

How to work with paths (`Path` class)?

Understanding and Using the Path Class in C# The Path class in C# provides static methods for manipulating file paths in a cross-platform way. It's part of the System.IO namespace and offers...

C# tutorials Input/Output (I/O) and Networking

Connecting to different database providers (SQL Server, PostgreSQL, MySQL, SQLite)

Entity Framework Core (EF Core) is a powerful ORM (Object-Relational Mapper) that allows you to interact with various database systems using .NET. This tutorial will guide you through connecting to...

C# tutorials Frameworks and Libraries

What are value converters?

Value converters in Entity Framework Core (EF Core) are a powerful mechanism for translating property values between your .NET entities and the database columns they map to. This allows you to handle...

C# tutorials Frameworks and Libraries

What is the `CallerArgumentExpressionAttribute` and how can it be used?

The CallerArgumentExpressionAttribute, introduced in C# 10, is a powerful feature that allows you to capture the expression passed as an argument to a method. This is particularly useful for creating...

C# tutorials Modern C# Features

Large Object Heap (LOH)

The Large Object Heap (LOH) in .NET is a region of memory specifically designed for storing large objects. Understanding the LOH is crucial for optimizing performance and preventing memory-related...

C# tutorials Memory Management and Garbage Collection

How to write raw SQL queries in EF Core?

This tutorial demonstrates how to execute raw SQL queries within Entity Framework Core (EF Core). While LINQ provides a powerful and convenient way to interact with your database, there are scenarios...

C# tutorials Language Integrated Query (LINQ)

Authentication and Authorization (Identity, JWT, custom policies)

This tutorial explores authentication and authorization in ASP.NET Core, covering Identity, JWT (JSON Web Tokens), and custom policies. Authentication verifies a user's identity, while authorization...

C# tutorials Frameworks and Libraries

Serialization and deserialization (`System.Text.Json`, `System.Xml.Serialization`, `BinaryFormatter`)

Serialization is the process of converting an object's state into a format that can be stored or transmitted. Deserialization is the reverse process, converting a serialized format back into an...

C# tutorials Input/Output (I/O) and Networking

What are discards (`_`) and how are they used?

Discards, introduced in C# 7.0, are write-only variables that you can assign values to when you don't intend to use those values. They are represented by the underscore character (_). Discards are...

C# tutorials Modern C# Features

What is a class and a struct in C#, and when to use each?

In C#, both classes and structs are used to define custom data types. However, they have fundamental differences that dictate when to use one over the other. Understanding these differences is crucial...

C# tutorials Core C# Fundamentals

How do you sort a Collection in C# (`List&lt;T&gt;.Sort()`, LINQ `OrderBy`)?

Sorting collections is a fundamental operation in C#. This tutorial explores two primary methods: the List.Sort() method and the LINQ OrderBy (and OrderByDescending) methods. We will cover how to...

C# tutorials Core C# Fundamentals

MediatR for in-process messaging (CQRS)

MediatR is a simple and powerful .NET library that implements the Mediator pattern. It allows you to decouple request handling from the actual request processing. It's commonly used to implement CQRS...

C# tutorials Frameworks and Libraries

What are the differences between `System.Exception` and its derived classes?

Understanding System.Exception and its Derived Classes in C# In C#, exception handling is crucial for building robust and reliable applications. The System.Exception class serves as the base class for...

C# tutorials Core C# Fundamentals

What is the null-coalescing operator (`??`) and how do you use it for default values?

Understanding the Null-Coalescing Operator (??) in C# The null-coalescing operator (??) in C# provides a concise way to assign a default value to a variable if the variable being assigned to is null....

C# tutorials Modern C# Features

How to handle large files efficiently?

This tutorial explores techniques for efficiently handling large files in C#. Working with large files can quickly consume system resources, leading to performance issues and even crashes. We'll focus...

C# tutorials Input/Output (I/O) and Networking

What are throw expressions and how do they simplify code?

Throw expressions, introduced in C# 7.0, provide a more concise and expressive way to throw exceptions within expressions. This feature allows you to throw exceptions in places where a statement is...

C# tutorials Modern C# Features

Performance considerations with LINQ

LINQ (Language Integrated Query) provides a powerful and concise way to query data in C#. While it offers significant advantages in terms of readability and maintainability, it's crucial to understand...

C# tutorials Language Integrated Query (LINQ)

What are Razor Components?

Razor Components, now formally known as Blazor components, are reusable UI building blocks in ASP.NET Core. They allow you to create interactive and dynamic web UIs using C# instead of JavaScript....

C# tutorials Frameworks and Libraries

What are thread-safe Collection classes in .NET (`ConcurrentBag<T>`, `ConcurrentDictionary<TKey, TValue>`, etc.)?

In multi-threaded applications, accessing and modifying collections concurrently can lead to data corruption and unpredictable behavior. .NET provides thread-safe collection classes within the...

C# tutorials Core C# Fundamentals

Implementing client-server communication

This tutorial demonstrates how to implement client-server communication in C# using the System.Net namespace. We'll cover creating a simple server that listens for connections and a client that...

C# tutorials Input/Output (I/O) and Networking

How to monitor file system changes (`FileSystemWatcher`)?

This tutorial demonstrates how to use the `FileSystemWatcher` class in C# to monitor changes to a directory or file. The `FileSystemWatcher` allows you to detect events such as file creation,...

C# tutorials Input/Output (I/O) and Networking

Working with DNS (`Dns` class)

This tutorial explores the Dns class in C# for resolving domain names to IP addresses and vice versa. Understanding DNS resolution is crucial for many network applications. We will cover basic usage,...

C# tutorials Input/Output (I/O) and Networking

How to use `SelectMany()` for flattening sequences?

The SelectMany() operator in LINQ is a powerful tool for flattening sequences of sequences into a single sequence. This tutorial provides a comprehensive guide on how to use SelectMany() in C# with...

C# tutorials Language Integrated Query (LINQ)

What is string interpolation and how do you use it?

String interpolation is a feature introduced in C# 6.0 that allows you to embed C# expressions directly within string literals. It provides a more readable and convenient way to format strings...

C# tutorials Modern C# Features

Immediate execution in LINQ (`ToList()`, `ToArray()`, etc.)

This tutorial explores immediate execution in LINQ to Objects using methods like `ToList()`, `ToArray()`, `ToDictionary()`, and `ToHashSet()`. We'll examine how these methods force the query to...

C# tutorials Language Integrated Query (LINQ)

What are list patterns in C# 11 and how can you use them for matching?

C# 11 introduced list patterns, a powerful feature for matching sequences of elements within collections like arrays and lists. List patterns allow you to examine the structure and content of these...

C# tutorials Modern C# Features