.NET
Microsoft's powerful, cross-platform development platform
.NET is a free, open-source developer platform created by Microsoft for building many different types of applications. With .NET, you can use multiple languages, editors, and libraries to build for web, mobile, desktop, games, IoT, and more.
Why Choose .NET?
Cross-Platform
Run on Windows, macOS, and Linux with .NET Core/.NET 5+
High Performance
Compiled code with excellent runtime performance and optimization
Rich Ecosystem
Extensive library ecosystem with NuGet package manager
Multiple Languages
Support for C#, F#, VB.NET, and other .NET languages
Enterprise Ready
Built for large-scale, mission-critical applications
Microsoft Support
Backed by Microsoft with long-term support and regular updates
What Can You Build with .NET?
Web Applications
Build modern web applications and APIs with ASP.NET Core
Real-World Examples:
Popular Frameworks:
Desktop Applications
Create Windows desktop applications and cross-platform apps
Real-World Examples:
Popular Frameworks:
Cloud & Microservices
Build scalable cloud applications and microservices
Real-World Examples:
Popular Frameworks:
Mobile Development
Cross-platform mobile apps with .NET MAUI and Xamarin
Real-World Examples:
Popular Frameworks:
.NET Code Examples
🚀 C# Console Application
// Program.cs
using System;
using System.Collections.Generic;
using System.Linq;
namespace HelloDotNet
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello, .NET!");
// Variables and Collections
var name = "Alice";
var age = 25;
var hobbies = new List<string> { "reading", "coding", "gaming" };
// String interpolation
Console.WriteLine($"My name is {name}, I'm {age} years old");
// LINQ example
var longHobbies = hobbies.Where(h => h.Length > 5).ToList();
Console.WriteLine("Long hobbies:");
longHobbies.ForEach(Console.WriteLine);
// Method call
var greeting = CreateGreeting(name, age);
Console.WriteLine(greeting);
}
static string CreateGreeting(string name, int age)
{
return $"Hello {name}, you are {age} years old!";
}
}
}🌐 ASP.NET Core Web API
// Controllers/UsersController.cs
using Microsoft.AspNetCore.Mvc;
[ApiController]
[Route("api/[controller]")]
public class UsersController : ControllerBase
{
private static List<User> users = new()
{
new User { Id = 1, Name = "Alice", Email = "alice@example.com" },
new User { Id = 2, Name = "Bob", Email = "bob@example.com" }
};
[HttpGet]
public ActionResult<IEnumerable<User>> GetUsers()
{
return Ok(users);
}
[HttpGet("{id}")]
public ActionResult<User> GetUser(int id)
{
var user = users.FirstOrDefault(u => u.Id == id);
if (user == null)
return NotFound();
return Ok(user);
}
[HttpPost]
public ActionResult<User> CreateUser(User user)
{
user.Id = users.Max(u => u.Id) + 1;
users.Add(user);
return CreatedAtAction(nameof(GetUser), new { id = user.Id }, user);
}
}
public class User
{
public int Id { get; set; }
public string Name { get; set; } = string.Empty;
public string Email { get; set; } = string.Empty;
}🚀 Getting Started with .NET
Install .NET SDK
Download the latest .NET SDK from dotnet.microsoft.com
Choose Your IDE
Visual Studio, Visual Studio Code, or JetBrains Rider
Create Your First Project
Use `dotnet new console` to create a simple console application
Learn C# Fundamentals
Master C# syntax, OOP concepts, and .NET ecosystem