Web Development with .NET

Overview

Welcome to the official .NET web development tutorial series. This guide walks you through building modern, high‑performance web applications using ASP.NET Core, Razor Pages, Blazor, and MVC.

Getting Started

Install the .NET SDK and create your first web project.

dotnet new webapp -o MyFirstApp
cd MyFirstApp
dotnet run

Open https://localhost:5001 in your browser to see the default Razor Pages template.

Core Concepts

Middleware: The request pipeline that processes HTTP requests.
Routing: Mapping URLs to endpoints using attribute or conventional routing.
Dependency Injection: Built‑in IoC container for managing services.
Razor Pages vs MVC vs Blazor: Choose the right UI model for your project.

Sample Project: Todo List API

Below is a minimal API implementation for a Todo list.

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Hosting;
using System.Collections.Generic;

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

var todos = new List<TodoItem>{
    new TodoItem{Id=1, Title="Learn ASP.NET Core", IsDone=false},
    new TodoItem{Id=2, Title="Build a project", IsDone=false}
};

app.MapGet("/todos", () => todos);
app.MapPost("/todos", (TodoItem todo) => { todos.Add(todo); return Results.Created($"/todos/{todo.Id}", todo); });
app.MapPut("/todos/{id}", (int id, TodoItem updated) =>
{
    var todo = todos.Find(t => t.Id == id);
    if (todo is null) return Results.NotFound();
    todo.Title = updated.Title;
    todo.IsDone = updated.IsDone;
    return Results.NoContent();
});
app.MapDelete("/todos/{id}", (int id) =>
{
    var todo = todos.Find(t => t.Id == id);
    if (todo is null) return Results.NotFound();
    todos.Remove(todo);
    return Results.NoContent();
});

app.Run();

record TodoItem(int Id, string Title, bool IsDone);

Run the API with dotnet run and explore it using Swagger UI (if Swagger is added).

Overview

Getting Started

Core Concepts

Sample Project: Todo List API

Further Reading