Integration of Python and C using .dll files

[Larz60+]

If you must use a dll, you can find out some of what it does with ilspy: http://ilspy.net/

here are some of it's features:

ILSpy Features

Assembly browsing

• IL Disassembly
  
• Support C# 5.0 "async"
  
• Decompilation to C#
  
• Supports lambdas and 'yield return'
  
• Shows XML documentation
  
• Decompilation to VB
  
• Saving of resources
  
• Save decompiled assembly as .csproj
  
• Search for types/methods/properties (substring)
  
• Hyperlink-based type/method/property navigation
  
• Base/Derived types navigation
  
• Navigation history
  
• BAML to XAML decompiler
  
• Save Assembly as C# Project
  
• Find usage of field/method
  
• Extensible via plugins (MEF)
  
• Assembly Lists
  

That's about the extent of what I can offer

There's another one here that looks pretty good: http://www.jetbrains.com/decompiler/