You cannot get the exact code, but you can get a decompiled version of it. The most popular (and best) tool is Reflector, but there are also other .Net ...
How to open and extract DLL file? · Click Select DLL file to open to open the file chooser. Extract DLL file. Extract DLL file · Drag and drop the DLL file ...
Step 1 Download and install a decompiler. · Step 2 Open the DLL file in your decompiler. · Step 3 Use the Assembly Explorer to browse the nodes of the DLL file.