C# Bad Practices: Learn How to Make Good Code by Using Examples of Bad Code

I will explain what troubles a badly written class could bring and present a way to replace it with a better solution -- using good practices and design patterns. The first part is for every developer who knows C# language basics - it will show some basic mistakes and techniques to make code readable like a book. The advanced part is for developers who have at least a basic understanding of design patterns -- it will show completely clean, unit testable code.