Recently I came across a use case of a form which needed two submit buttons. One submit button would just save the data for further edition. Second submit button would save the data and lock it, so you wouldn’t be able to edit it anymore. The best way I know to solve this task is …
Value tuples is one of the features added in C# 7. I’m going to show you why it was introduced to language and how you can use it. Tuple Before we start with value tuples let’s take a look at regular tuples. What’s a Tuple? Basically it’s a set of grouped properties. You can use …
Dictionary is a handy class. It’s a collection of key-value pairs. It is a hash table which means that it has to have unique keys (according to equality comparer). Each key is mapped to a value. Retrieving a value by key is very fast. There are many things you can do with it. In this …
Before we get into unit testing we should ask ourselves why would anyone write code to test other code? Is there any reason to do that extra work? It turns out that there are many reasons for that. Firstly, you’re going to make sure that given function works as expected. Secondly, if you decide to …
An introduction to unit testing using xUnit.net in .NET Core Read More »
You want to learn your first programming language. You read about it a little bit and you decide which programming language to learn. Then you read that big book full of syntax or you watch these programming videos and … nothing. When you open your IDE you can only stare on that blinking cursor, your …
Having trouble learning your first programming language? Read More »
Why do I think you only need 3 or 4 programming languages? Because I think that with 4 different languages represents big enough array of programming techniques to complete (almost) any project. It’s not about the languages itself, but rather the way of thinking and working which helps us become better as software developers and …
Why you only need to know 3 (or 4) programming languages Read More »
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 …