.NET Tutorial

Official Documentation

This tutorial is based on official Microsoft .NET documentation. Visit: .NET Documentation

Welcome to the .NET tutorial! .NET is a free, open-source, cross-platform framework for building modern applications.

What is .NET?

┌─────────────────────────────────────────────────────────────┐
│                      .NET Platform                           │
├─────────────────────────────────────────────────────────────┤
│                                                              │
│   ┌──────────┐  ┌──────────┐  ┌──────────┐  ┌──────────┐   │
│   │   Web    │  │ Desktop  │  │  Mobile  │  │  Cloud   │   │
│   │ ASP.NET  │  │WPF/WinUI │  │  .NET    │  │  Azure   │   │
│   │  Core    │  │  Blazor  │  │  MAUI    │  │Functions │   │
│   └──────────┘  └──────────┘  └──────────┘  └──────────┘   │
│                                                              │
├─────────────────────────────────────────────────────────────┤
│                    Base Class Library                        │
│         (Collections, IO, Networking, Security, etc.)        │
├─────────────────────────────────────────────────────────────┤
│                  .NET Runtime (CLR)                          │
│        (Garbage Collection, JIT, Type System)                │
├─────────────────────────────────────────────────────────────┤
│       Windows    │    macOS    │    Linux    │    More      │
└─────────────────────────────────────────────────────────────┘

Why Learn .NET?

Feature	Description
Cross-Platform	Build and run on Windows, macOS, and Linux
High Performance	One of the fastest web frameworks available
Versatile	Web, desktop, mobile, cloud, IoT, AI/ML
Enterprise Ready	Powers major companies worldwide
Great Tooling	Visual Studio, VS Code, and CLI tools
Large Ecosystem	NuGet packages, community, and support

What You'll Learn

Beginner

• Getting Started - Setup and first project
• Project Structure - Understanding .NET projects
• CLI Tools - Using the dotnet command

Intermediate

• Dependency Injection - DI fundamentals
• Configuration - App settings and options
• Logging - Structured logging

Advanced

• Middleware - HTTP pipeline
• Entity Framework - Database access
• Testing - Unit and integration tests
• Deployment - Publishing applications

Prerequisites

• ✅ Basic C# knowledge (see C# Tutorial)
• ✅ Command line familiarity
• ⭐ Optional: Understanding of web concepts

Quick Preview

// Minimal API in .NET
var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

app.MapGet("/", () => "Hello, World!");

app.MapGet("/api/users/{id}", (int id) =>
{
    return new { Id = id, Name = "John Doe" };
});

app.Run();

Setting Up Your Environment

Install .NET SDK

Windows

# Download from https://dotnet.microsoft.com/download
# Or use winget:
winget install Microsoft.DotNet.SDK.8

macOS

# Using Homebrew:
brew install dotnet-sdk

Linux

# Ubuntu/Debian:
sudo apt-get update
sudo apt-get install -y dotnet-sdk-8.0

Verify Installation

dotnet --version
dotnet --list-sdks

Create Your First Web API

# Create a new Web API project
dotnet new webapi -n MyFirstApi

# Navigate to project
cd MyFirstApi

# Run the application
dotnet run

Project Types

Template	Command	Description
Console	dotnet new console	Command-line application
Web API	dotnet new webapi	RESTful API service
MVC	dotnet new mvc	Model-View-Controller web app
Blazor	dotnet new blazor	Interactive web UI with C#
Worker	dotnet new worker	Background service
Class Library	dotnet new classlib	Reusable library

.NET Ecosystem

┌─────────────────────────────────────────────────────────────┐
│                     Application Types                        │
├─────────────┬─────────────┬─────────────┬──────────────────┤
│   ASP.NET   │   Blazor    │    MAUI     │     Console      │
│   Core      │   (WASM/    │   (Cross-   │    (CLI/         │
│   (APIs,    │   Server)   │   platform  │    Workers)      │
│   MVC)      │             │   Mobile)   │                  │
├─────────────┴─────────────┴─────────────┴──────────────────┤
│                       Libraries                              │
├──────────────────────────────────────────────────────────────┤
│  Entity Framework  │  Identity  │  SignalR  │  gRPC         │
│  (ORM)            │  (Auth)    │  (Realtime)│  (RPC)        │
└──────────────────────────────────────────────────────────────┘

Video Tutorials

Recommended Video Resources

Learn .NET through these excellent tutorials.

Free Courses

Course	Creator	Description
.NET 8 Full Course	Les Jackson	Complete ASP.NET Core tutorial
.NET Web API Tutorial	Teddy Smith	Building Web APIs
.NET Microservices	Les Jackson	Microservices architecture

Let's Begin!

Ready to start? Head over to Getting Started to create your first .NET application!