Windows API Reference

Base Class Library (.NET Core & .NET 5+)

Explore fundamental types, algorithms, and application infrastructure.

System Namespace Provides fundamental classes and base types used by all .NET applications.
System.Collections Namespace Defines interfaces and classes that define collections of objects.
System.IO Namespace Provides types that allow reading and writing files and data streams.
System.Threading Namespace Supports the creation and management of threads.
System.Reflection Namespace Provides classes and interfaces that enable reflection to examine assemblies, modules, and types.

Windows Forms

Build rich, interactive desktop applications for Windows.

System.Windows.Forms Namespace Provides classes that create Windows-based applications.
System.Drawing Namespace Provides access to basic graphics functionality.

Windows Presentation Foundation (WPF)

Create visually stunning and adaptive user interfaces.

System.Windows Namespace Defines the core types and classes for WPF.
System.Windows.Controls Namespace Contains classes for UI elements like buttons, text boxes, and layouts.
System.Windows.Media Namespace Provides classes for graphics, imaging, and animation.

ASP.NET (Core)

Develop modern, cloud-ready web applications and services.

Microsoft.AspNetCore.Mvc Namespace Classes for building web applications with the Model-View-Controller (MVC) pattern.
Microsoft.AspNetCore.Hosting Namespace Classes for configuring and running ASP.NET Core applications.
Microsoft.AspNetCore.Http Namespace Classes for handling HTTP requests and responses.

Data Access

Connect to and interact with various data sources.

System.Data Namespace Provides classes for working with data.
System.Data.SqlClient Namespace Classes for connecting to and interacting with Microsoft SQL Server.
Entity Framework Core Modern data access technology for .NET. (Links to external docs)

Networking

Build network-enabled applications.

System.Net Namespace Provides classes for network programming.
System.Net.Http Namespace Provides classes for sending HTTP requests.
System.Net.Sockets Namespace Provides classes for low-level socket programming.

Example: String Manipulation

A simple example using the System.String class.


using System;

public class Example
{
    public static void Main(string[] args)
    {
        string greeting = "Hello, World!";
        Console.WriteLine(greeting.ToUpper()); // Output: HELLO, WORLD!
        Console.WriteLine(greeting.Contains("World")); // Output: True
    }
}

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