It’s an interesting feature. In some cases it’s better when users can preview image before uploading it, e.g. when you want to let users trim the image or process it in any way. As you’ll see it’s pretty easy to do. After reading this article you will know how to add this feature to your …
How to preview image before uploading using Javascript Read More »
Reflection code snippets tested under .NET Core 2. What is reflection and how can you benefit from it Reflection allows a program to inspect or modify itself during runtime. In practice it means that you can do all sorts of stuff on objects/properties including checking type of an object at runtime (typeof), listing all fields …
.NET reflection – theory, security and all the snippets you need in C# Read More »
One of the many security risks which you should consider is a mass assignment vulnerability (cheatsheet) also know as overposting. While it’s not in OWASP Top 10 it’s still considered important. Read on to understand the issue and find out possible ways of fixing it. Mass assignment explained ASP.NET Core allows automatic model binding of …
Many beginners struggle with understanding the Big O notation. I’ll show you a simple way to understand it with examples. It’s not mathematical, professional or academic, but hopefully it will help you understand it. What is Big O You’re writing your code and suddenly you come up with a problem which you can solve using …
Middleware is a piece of software that handles requests and responses in the middle of application pipeline. An example of built-in ASP.NET Core middleware is authentication component and response caching component. In this article I’ll show you how to create global exception handler using custom middleware component. This article will teach you how to create …
ASP.NET Core: Global exception handler middleware Read More »
In this post I’ll show you how you can extend built-in tag helpers. What are tag helpers? Basically tag helpers are classes which take part in processing (or creating) HTML elements inside Razor views. You can create C# code which will target desired HTML and produce desired output. For more throughtout explanation see Introduction to …
You’ve probably heard about Richard Feynman physicst and a Nobel price winner. Are you wondering what does he have to do with programming or blogging? I’ll explain it in a moment, but let’s start with one of the more interesting skills he had. He was nicknamed “The Great Explainer” because he could explain complex and …