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.NET Applications

.NET (pronounced "dot net") is a software development framework by Microsoft that supports building many types of applications:

Types of Applications Built with .NET

  • Web Applications – Using ASP.NET
  • Desktop Applications – Using Windows Forms, WPF
  • Mobile Apps – Using .NET MAUI or Xamarin
  • Cloud-Based Applications
  • Games – Built with Unity
  • IoT Applications

Supported Languages

  • C# (most commonly used)
  • VB.NET
  • F#

.NET apps are known for security, structure, and performance.

What is a CMS (Content Management System)?

A CMS is a software tool that helps you create, edit, manage, and publish digital content — usually websites — without writing code.

Features of a CMS:

  • Add or update blog posts
  • Upload images and media
  • Manage users and permissions
  • Change designs via themes/templates
  • Extend functionality via plugins (e.g., SEO tools, contact forms)
  • WordPress
  • Drupal
  • Joomla
  • Magento (eCommerce)
  • Shopify (cloud-based eCommerce CMS)

Web Server vs Application Server

Feature Web Server Application Server
Handles Static Content (HTML, CSS, JS, Images) Dynamic Content (Runs server-side code)
Executes Code? ❌ No ✅ Yes
Use Case Serves files directly Runs business logic, APIs, database access
Examples Apache, Nginx, IIS Tomcat, JBoss, ASP.NET Core

They Often Work Together:

Example:

  • Nginx (Web Server) → forwards dynamic requests to → Node.js (Application Server)

Why Use Nginx in Front of Node.js?

Reason Purpose
Reverse Proxy Hides internal details, routes requests
Load Balancing Distributes traffic to multiple Node.js instances
SSL Termination Handles HTTPS encryption
Static File Serving More efficient at serving static content
Security Filters bad requests, rate limits
Graceful Restarts Allows restarting Node.js without downtime

What is a CDN?

A CDN (Content Delivery Network) is a network of servers around the globe that delivers content to users from the closest server, speeding up load times.

How It Works:

  • Without CDN → Content from US → Slow
  • With CDN → Content from India-based server → Fast

Delivers:

  • Images
  • Videos
  • JS/CSS files
  • Fonts
  • Cached HTML pages

Benefits:

  • Faster load times
  • Reduced server load
  • DDoS protection
  • Scalability & availability
  • Cloudflare
  • Akamai
  • Amazon CloudFront
  • Google Cloud CDN
  • Fastly

Relationship Between Browser, CDN, Web Server & App Server

Browser
    ↓
CDN → (serves static content if cached)
    ↓
Web Server → (serves static files or forwards)
    ↓
Application Server → (executes logic, fetches data)

Web 1 vs Web 2 vs Web 3

Web Generation Key Features Examples
Web1 Static, read-only pages GeoCities, early Yahoo
Web2 Interactive, user-generated content Facebook, YouTube, Instagram
Web3 Decentralized, blockchain-based, user-owned data Crypto wallets, dApps, NFTs (OpenSea)

Summary:

  • Web1 = Read-only
  • Web2 = Read + Write (social)
  • Web3 = Decentralized + User ownership

What is AJAX?

AJAX (Asynchronous JavaScript and XML) allows web pages to update data without reloading the entire page.

  • Sends background requests to the server.
  • Updates only part of a page (like chat messages or form data).
  • Used in modern web apps to make them faster and more interactive.

What is XML?

XML (eXtensible Markup Language) is used for storing and transporting data in a structured, readable, and platform-independent format.

Key Features:

  • Self-descriptive
  • Hierarchical (tree structure)
  • Extensible (custom tags allowed)
  • Human-readable
  • Cross-platform

Example:

<book>
  <title>Learning XML</title>
  <author>John Doe</author>
  <price>29.99</price>
  <availability>In Stock</availability>
</book>

XML vs JSON

Feature XML JSON
Format Tag-based Key-value pairs
Readability Verbose More concise
Custom Tags Allowed Not applicable
Attributes Supported Not supported (only key-values)
Common Use Cases SOAP APIs, Configs, RSS REST APIs, Data exchange

JSON Version of XML Example:

{
  "book": {
    "title": "Learning XML",
    "author": "John Doe",
    "price": "29.99",
    "availability": "In Stock"
  }
}

Notes

  • Botnets: A network of hijacked internet-connected devices that are installed with malicious codes known as malware.
  • Virus and Worms: A Worm is a form of malware that replicates itself and can spread to different computers via Network. A Virus is a malicious executable code