If you are a software developer, you're likely aware that there are times when you need to decompile certain assemblies to gain a clearer understanding of their functionality, that is, to reverse engineer it. However, achieving this without the right tools can often be quite challenging. Fortunately, there are many software solutions available, such as dnSpy, which enable you to obtain quick and effective results.

ILSpy is a free and open-source .NET assembly browser and decompression tool that is pretty popular in the C# development field, developed by ICSharpCode (i.e. the development team of SharpDevelop). It has the user interface, layout, and decompilation functions similar to Red Gate Software's .NET Reflector. Moreover, sometimes for some assemblies that can not be decompiled with .NET Reflector (because of encryption), it's still possible to do that using ILSpy. Simply speaking, it has only one purpose - to finally completely replace .NET Reflector and do better.