To box (and unbox)? Or better not to?


Working with types sometimes can be very tricky for a developer, regardless of the employed programming language. Surely, many professionals have a story or two to share on this. Types can be tricky beasts and it’s not uncommon to be accompanied with few surprises and often sinister quirks which can cause all kinds of trouble. In this post, I want to discuss about boxing & unboxing value types, the performance penalty of this technique and ways to avoid this altogether when applicable.

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Stack of pancakes

Learning data structures – Stack in depth in C#

What is a stack and how it works? What is an Abstract data type and how it’s related with the stack? In this post we’ll explore the stack data structure, I’ll go through the theory behind, explain why stacks are important programming tools, create a custom implementation of a stack with an array from scratch and finally, go through some interesting examples. By the end of this post I do hope that you’ll have a very good understanding of how a stack works under the hood and how you can use it to tackle day-to-day programming problems.

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Structs and the in keyword in C#

Since the release of 7.0 version for C#, we’ve seen many small, yet useful features added to the language, aiming to aid developers, directly or indirectly. A new keyword was added in version 7.2, the in keyword, which makes the reference semantics of the language richer. In this post, I will explore this new keyword, along with readonly structs and the ref readonly modifier.

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Learning data structures – Arrays in C#

This is the first post in the series on Learning data structures. What this series aims is to provide basic knowledge on some popular data structures and their algorithms, their use cases and how such knowledge can unleash your potential into thinking and solving problems. In this series I’ll focus primarily in the C# language but I might discuss some topics in the F# language as well, for the most part though I will materialize theory in C# code.

In this post I will discuss about the most fundamental data structure in computer science, arrays.

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ASP.NET Core 2.0 Authentication with Azure Active Directory B2C

In today’s post of ASP.NET Core 2.0 Authentication series, I am going to discuss about Azure Active Directory B2C, a service provided by Microsoft Azure for identity access and management.
In previous post, I talked about Azure Active Directory and how useful it is in corporate scenarios, however B2C is a better option for external user access and identity management, with powerful features such as support for various identity providers, policies and many more.

I will first briefly discuss about Azure AD B2C, what is it and how it is different from standard Azure AD. Then I am going to show you how to setup a tenant on Azure Portal, how to configure an identity provider, GitHub in this scenario, and how to setup policies. In the last part, I will show you how to configure your application to authenticate users using Azure AD B2C and how to handle failure events.

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ASP.NET Core 2.0 Authentication with local logins – Implementing custom authorization policies

This post is part of a series on ASP.NET Core 2.0 Authentication and I am going to talk about authorization policies, something different from what we’ve seen so far in the series, as most of posts are focusing in authorization.

I will show how to secure certain resources based on specific criteria on user’s claims.

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ASP.NET Core 2.0 Authentication with local logins – Responding to backend changes

ASP.NET Core 2.0 makes it very easy and straightforward to setup a cookie authentication mechanism in your application. Framework provides numerous ways to achieve that, with or without ASP.NET Core Identity membership system.

This post is part of a series on ASP.NET Core 2.0 Authentication and I am about to talk about cookie events and how to respond to them.
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