dnSpy

If you work as a software developer, you probably understand that sometimes you might need to decompile certain assemblies to understand their functionality in a more efficient manner.
However, doing so without the appropriate set of tools is often impossible. Fortunately, there is a wide variety of software solutions such as dnSpy that can help you achieve quick, satisfactory results.

No setup required

Since it is a portable tool, it does not require you to install it on the target computer, as simply unpacking its archive and launching the executable grants you full access to its functions.
You can also run it from removable storage media such as USB flash drives or External HDDs. Furthermore, it does not modify registry entries from your system nor does it generate additional files or folders on your PC without your explicit permission.

Comprehensive interface

dnSpy comes with a stylish, comprehensive user interface that packs a broad range of useful functions, which are neatly organized in standard menus on the main window.
More so, it features a standard configuration window where you can adjust settings for various components such as its decompiler, debugger or hex editor, but you can also modify display or miscellaneous parameters, as well.

.NET disassembler

You can turn to dnSpy if you need an efficient tool that can help you decompile .NET assemblies by providing you with a wide variety of useful tools. It comes with a decompiler, a debugger, a hex editor and also an assembly editor, letting you handle assemblies in an efficient manner.
The main window comes with an Assembly Explorer pane, where you can access a tree view of the desired assembly. You can open an assembly by either specifying an appropriate file from your computer or by using the Open from GAC option, which provides you with a list of entries available in the Global Assembly Cache.

Reliable reverse engineering tool for .NET assemblies

All things considered, dnSpy is a handy application that enables you to reverse engineer .NET assemblies in an effective manner by providing you with a broad range of useful tools, including a decompiler, an assembly editor and a debugger. It requires no installation, comes with a comprehensive, smooth user interface and provides you with a standard configuration window where you can adjust settings for various of its components.