.NET Reflector

.NET Reflector is a comprehensive and practical piece of software especially designed for developers who need to decompile and fix .NET code, as well as debug libraries, components, and frameworks.
Using this program you are able to save time and simplify development by debugging into the .NET source that you currently work with. This way, you can follow bugs, third-party components and any compiled code effortlessly.
Also, .NET Reflector allows you to check that the right version of your component is presented and make sure that the obfuscation is effective. You can look inside DLLs and *.exe files with ease, thus understanding how apps were designed and starting to reconstruct the missing or corrupted code.
The main window enables you to open as many DLL files as you want and decompile or analyze them instantly. You can find out whether bugs are in your code or in third-party apps, attach breakpoints, and debug live in order to view how your program behaves in real time.
Since .NET Reflector also works as a Visual Studio plugin, you are able to use these debugging techniques on any assembly, so the source code is always available for your libraries. On this matter, you can understand how APIs, frameworks, components and all the critical code you use really works.
Another important feature that makes the application stand out is that it supports C# and .NET 1.0, .NET 2.0 and even .NET 4.0, so you can easily decompile the assemblies and replace poor or missing documentation, regardless of the source file.
Overall, .NET Reflector proves to be a steady and reliable solution when it comes to creating better controls and WebParts, tracking down the source of errors in your own code or other components and libraries and fixing any .NET code.