GitHub Copilot 18 min read · September 7, 2026

Building a GitHub Copilot Security Agent for Legacy Systems (Honestly)

Learn what a GitHub Copilot security agent can find in a legacy system, what it can miss, and why scanners and people must still approve changes.

Suthahar Jegatheesan · Part 3 of a series

AI From the archive · 23 Jul 2026

Copilot Isn't Autocomplete Anymore: Inside Agent Mode

A few months ago I was helping a teammate set up Copilot for the first time. He typed a comment, waited for the ghost text, hit tab, and said "cool, so it's like a smarter autocomplete." I…

• Github Copilot

Suthahar Jegatheesan

Azure 5 min read · August 18, 2026

How Azure Protects a Mobile App: The Full Request Flow, Layer by Layer

Front Door, your API, Microsoft Entra ID, authorization and a private database — the five layers that stand between a mobile app and its data on Azure.

Suthahar Jegatheesan · Part 2 of a series

AI From the archive · 19 Feb 2026

Why LLMs Don’t Have Memory — But Still Feel Smart

Every day, millions of people use AI tools like ChatGPT and Copilot. If you want to understand modern artificial intelligence, you can’t ignore Large Language Models (LLMs) . They power…

Suthahar Jegatheesan

Azure 4 min read · August 16, 2026

Your Mobile App Is Leaking Its API Key — and Obfuscation Will Not Save It

An APK or IPA is a zip file. Anything hardcoded inside it, including your API key, is already public — and here is how to get it off the phone for good.

Suthahar Jegatheesan · Part 1 of a series

AI From the archive · 16 Sept 2025

AI Evolution Explained: GenAI vs LLMs vs AI Agents vs Agentic AI vs Intelligent AI

Artificial Intelligence (AI) is one of the most exciting technologies in our world today. But the terms that come with it like GenAI, LLMs, AI Agents, Agentic AI, and Intelligent AI can…

• Azure

Suthahar Jegatheesan

AI 14 min read · August 5, 2026

From Search Box to AI Agent: Microsoft Foundry (Azure AI Foundry) for a Food Delivery App

The business case for an AI agent on an app that already exists, what an agent really is, and the architecture that keeps it inside its lane.

Suthahar Jegatheesan · Part 2 of a series

Azure 12 min read · July 20, 2026

What Is Microsoft Foundry (Azure AI Foundry)? The Services, and When You Actually Need Them

A plain tour of Microsoft Foundry for developers: the resource, projects, models, agents, tools, and when Azure OpenAI on its own is enough.

Suthahar Jegatheesan · Part 1 of a series

AI 4 min read · July 18, 2026

Building a RAG Pipeline in .NET with Azure OpenAI and Azure AI Search

End-to-end retrieval-augmented generation in C#: chunking, embeddings, hybrid vector search, and grounding a chat completion so it cites its sources.

Suthahar Jegatheesan

Azure From the archive · 10 Aug 2025

Azure AI Service, Studio, ML & Foundry – Which One Do You Need?

If you have used Microsoft AI tools in the past, you might remember popular services like Cognitive Services and the Bot Framework. These tools were widely used to add features like speech…

Suthahar Jegatheesan

Web 4 min read · July 10, 2026

How to Secure a .NET Minimal API with JWT Bearer Authentication

A working JWT bearer auth setup for ASP.NET Core Minimal APIs — token validation, role policies, and the config mistakes that silently disable security.

Suthahar Jegatheesan · Part 2 of a series

Web 3 min read · June 28, 2026

Structuring a .NET Minimal API Project That Survives Growth

Program.cs stops scaling around twenty endpoints. Here is a vertical-slice layout for Minimal APIs that keeps routing, validation and handlers organised.

Suthahar Jegatheesan · Part 1 of a series

GitHub Copilot 19 min read · June 9, 2026

Making GitHub Copilot Understand a Legacy Codebase Nobody Documented

A repeatable method for legacy discovery: turning the business rules, workflows and history a codebase never documented into knowledge Copilot uses.

Suthahar Jegatheesan · Part 2 of a series

Azure From the archive · 18 Apr 2025

How to Get an Free Azure Subscription for Learning

This guide will help you get started with Microsoft Azure for free. It explains three easy ways: using a Free Azure Account Signing up for Azure for Students (no credit card needed),…

Suthahar Jegatheesan

GitHub Copilot 21 min read · June 7, 2026

GitHub Copilot Agents for Legacy Applications: A Complete Guide to Building an AI-Powered Development Team

A handbook for GitHub Copilot Agents on legacy code: what is a real feature, what is a pattern, and how to build an AI development team around it.

Suthahar Jegatheesan · Part 1 of a series

AI 11 min read · June 3, 2026

What Is an AI Token? Why Every AI Cost Is Calculated in Them

Tokens are not words, and they are not characters. Here is what a token really is, why AI billing counts them, and how to work out the cost of a request.

Suthahar Jegatheesan · Part 11 of a series

GitHub Copilot 10 min read · June 1, 2026

How to Save AI Tokens: 15 Habits That Cut My Copilot Context Waste

Fifteen tested habits that cut my monthly AI token usage without cutting how much I use AI, from context discipline to knowing when to restart a chat.

Suthahar Jegatheesan · Part 13 of a series

C# From the archive · 20 Feb 2025

C# Object and Dynamic Types

This blog provides an in-depth explanation of object and dynamic types in C#. Object Type 1. Overview object is the base class for all data types in C#. It can store any type of value,…

Suthahar Jegatheesan

GitHub Copilot 14 min read · May 30, 2026

400K AI Tokens a Month: My Daily GitHub Copilot Workflow That Makes the Budget Last

A 400K monthly AI token budget sounds generous until agent mode eats it in a week. Here is the daily Copilot workflow I use to make it last the month.

Suthahar Jegatheesan · Part 12 of a series

GitHub Copilot 17 min read · May 29, 2026

GitHub Copilot Hooks for Beginners: Why You Need Them and What You Can Build

A beginner GitHub Copilot Hooks tutorial: what a hook is, why an AI agent needs deterministic guardrails, and how to write your first one in ten minutes.

Suthahar Jegatheesan · Part 10 of a series

GitHub Copilot 16 min read · May 25, 2026

GitHub Copilot PR Summary: How to Get Descriptions Reviewers Actually Read

The GitHub Copilot PR summary: why an auto-generated description that restates the diff is noise, and how to get one reviewers actually read.

Suthahar Jegatheesan · Part 9 of a series

C# From the archive · 22 Oct 2023

Improving C# Performance by Using AsSpan and Avoiding Substring

During development and everyday use, Substring is often the go-to choice for string manipulation. However, there are cases where Substring can negatively impact performance and result in…

Suthahar Jegatheesan

GitHub Copilot 16 min read · May 23, 2026

GitHub Copilot Can't Replace Your Code Reviewer — Here's What It Can Actually Automate

A software architect on GitHub Copilot code review — build a Skill that automates the mechanical layer, and the limits that keep a human in the loop.

Suthahar Jegatheesan · Part 8 of a series

GitHub Copilot 19 min read · May 21, 2026

Building an Azure Copilot Skill: Secure, Cost-Aware Cloud Baselines with Bicep, Start to Finish

Build one GitHub Copilot Skill (SKILL.md) that guards your Azure Bicep — Managed Identity, private networking and cost tiers Copilot will not violate.

Suthahar Jegatheesan · Part 7 of a series

GitHub Copilot 21 min read · May 19, 2026

Building a Flutter Copilot Skill: Clean Architecture with BLoC and Firebase, Start to Finish

Build one GitHub Copilot Skill (SKILL.md) so Copilot writes Flutter the way your app does — layered folders, BLoC state, Firebase behind a repository.

Suthahar Jegatheesan · Part 6 of a series

C# From the archive · 3 Sept 2023

Free Microsoft Certification : C#

Microsoft announced a new Foundational C# certification in collaboration with FreeCodeCamp. The Foundational C# certification is completely free for individuals in all regions. The…

• certification

Suthahar Jegatheesan

GitHub Copilot 16 min read · May 17, 2026

Building Your First GitHub Copilot Skill: A .NET Clean Architecture SKILL.md, Start to Finish

A build-along for .NET developers — create one GitHub Copilot Skill (SKILL.md) that enforces Clean Architecture, CQRS and your API contract.

Suthahar Jegatheesan · Part 5 of a series

GitHub Copilot 19 min read · May 15, 2026

GitHub Copilot Skills Deep Dive: The Missing Layer Between Prompts, Instructions, and Agents

GitHub Copilot Skills explained by an architect — what they are, how they differ from prompts and instructions, and how to build reusable Skills for teams.

Suthahar Jegatheesan · Part 4 of a series

C# From the archive · 26 Aug 2023

Visual Studio 2022: C# Global Namespace

Global usings were introduced in C# 10 and .NET Core 6.0 and later versions. This feature proves to be highly beneficial as it allows you to incorporate commonly used namespaces. As a…

Suthahar Jegatheesan

C# From the archive · 22 Jul 2023

DateOnly And TimeOnly Types In .NET 6 -.NET Core

In this article, we will discuss Microsoft introduced new types DateOnly and TimeOnly in C# and examine the unique functionalities offered by each, and assist in determining the suitable…

Suthahar Jegatheesan

MAUI From the archive · 26 Nov 2022

.NET MAUI App: MAUI app icon, MAUI splash screen, and MAUI image to different mobile platforms.

Managing images, icons, and splash screens cross-platform is more challenging since we need to manage assert and resource folders specific to each platform, as well as image folders for…

• Xamarin

Suthahar Jegatheesan

MAUI From the archive · 18 Nov 2022

.NET MAUI : Runs on multiple platforms in one project (iOS, Android, and Windows)

The name MAUI stands for .NET Multi-platform App UI. Many IT companies struggle with deciding whether to migrate from XAMARIN or to start from scratch with a new hybrid application. You…

• Xamarin

Suthahar Jegatheesan

MAUI From the archive · 8 Jul 2022

How to use .Net MAUI Secure storage in your Mobile application ( iOS, Android and Windows )

.NET MAUI provides different techniques for local storage, in my previous article, explain preferences. This article will explain how to use secure storage in your mobile iOS, Android, and…

• Xamarin

Suthahar Jegatheesan

MAUI From the archive · 22 Jun 2022

.Net MAUI : Mobile local Storage Preferences using .NET MAUI

.NET MAUI provides 4 techniques for local storage options for storing data in locally on a device, depending on the nature, structure, and size of the data. The most used following 4 ways…

• Xamarin

Suthahar Jegatheesan

Azure From the archive · 20 Jun 2022

How to learn Azure without paid subscription

Microsoft Azure is a cloud service that is constantly expanding to help your organization meet business challenges. You can build, and manage to deploy applications using the following…

Suthahar Jegatheesan

MAUI From the archive · 24 May 2022

.NET MAUI : VerticalStackLayout and HorizontalStackLayout Layout using Visual Studio 2022

This article provides an understanding of VerticalStacklayout and HorzontalStackLayout using .NET Multi-platform APP UI (MAUI), which is a cross-platform framework for creating native…

• Xamarin.Forms

Suthahar Jegatheesan

Azure From the archive · 30 Apr 2022

Microsoft Enterprise Skills Initiative: Free Live training, Free Exam Voucher, and Free Practice exam simulations for Corporate Employee

The Microsoft certification is become more trend because of a lot of job openings for whose completed certification, same time most employees searching the internet “Free Azure dumps”,”…

• certification

Suthahar Jegatheesan

MAUI From the archive · 27 Mar 2022

Xamarin MAUI: Pair to Mac M1 chip from Windows machine for iOS development using Visual Studio 2022 Preview

.Net MAUI is a cross-platform framework for creating native mobile and desktop apps with c# and XAML. You can refer to my previous article for getting started with the Dotnet MAUI…

• Xamarin
• Xamarin.iOS

Suthahar Jegatheesan

MAUI From the archive · 23 Nov 2021

Xamarin MAUI: First iOS, Android and Windows Mobile App using Visual studio 2022

.Net MAUI is a cross-platform framework for creating native mobile and desktop app with c# and Xaml. In my previous article, we did warn welcome to Dotnet MAUI and shared information about…

• Xamarin
• Xamarin.Android
• Xamarin.Forms

Suthahar Jegatheesan

Azure From the archive · 2 Aug 2021

Microsoft Azure : Create a key vault

An Azure key vault is a cloud service for securely storing and accessing secrets. A secret is anything that you want to tightly control access to such as API Key and Subscription, Password,…

Suthahar Jegatheesan

Azure From the archive · 23 May 2021

Microsoft Azure: Configure Azure App Service Logging

Azure App service logging are the output of runtime trace statement in the different app code. logging feature will help you might only want to see a logged message when a particular level…

Suthahar Jegatheesan

Azure From the archive · 22 May 2021

Microsoft Azure: Create an App Service by using Azure Portal

The Azure App Service is an HTTP-based service for hosting web applications, REST APIs, and mobile back ends. We can create and deploy using different languages like .Net, .Net Core, Java,…

Suthahar Jegatheesan

Azure From the archive · 15 May 2021

Microsoft Azure: Avoid unknown or accidental deletion of Azure resources

Azure has role-based access control (RBAC) to restrict access to resources and management features, but it can’t be used to quickly prevent the users from accidentally deleting a resource.…

Suthahar Jegatheesan

Azure From the archive · 14 May 2021

Microsoft Azure: Create a Storage Account

An Azure storage account contains all of the storage data objects like blobs, files, queues, tables, and disks. The storage account provides a unique namespace for azure storage data that…

Suthahar Jegatheesan

Awards From the archive · 25 Apr 2021

MSDEVBUILD in Feedspot Top 100 Microsoft Azure Blogs

I am pleased to announce my blog msdevbuild.com again has been listed on the popular Feedspot website as one of the Top 100 Microsoft Azure Blogs, Websites, and Influencers in 2021!…

• News

Suthahar Jegatheesan

MAUI From the archive · 14 Apr 2021

Xamarin : Step-by-Step Guide To Building .NET Multi-platform App (MAUI) using Visual Studio 2019 Preview 16.10

Xamarin was released 10 years before, it has helped many developers to develop mobile apps with multi-platform with native feel but now it’s time to say goodbye to Xamarin and happily…

• Xamarin

Suthahar Jegatheesan

Azure From the archive · 10 Apr 2021

Microsoft Azure : Setup new Active Directory B2C tenant

Azure AD B2C stands for azure active directory Business to consumer. AZURE AD B2C has its own login portal management which can be customized to a certain extent to change the look and feel…

Suthahar Jegatheesan

Azure From the archive · 28 Mar 2021

Azure: How do I add a chat bot to Blogger

The Bot Application runs inside Skype, web chat, Facebook, Message, etc. Users can interact with bots by sending them messages, commands, and inline requests. You control your bots using…

• Bot
• AI

Suthahar Jegatheesan

Azure From the archive · 22 Mar 2021

Azure: Develop Azure Functions using Visual Studio

The azure function is a serverless concept of cloud-native design that allows a piece of code to be deployed and executed without any need for server infrastructure, web server, or any…

Suthahar Jegatheesan

More From the archive · 21 Mar 2021

Microsoft Exam : Free Retake Exam (Second Shot) and Free Practice Test

The Microsoft Certified Professional or MCP Program is the certification program offered by Microsoft that enables IT Professionals and Developers to validate their technical expertise.…

Suthahar Jegatheesan