dotpeek - Robuta Search

https://www.jetbrains.com/help/decompiler/Navigation_and_Search__Finding_Usages__Viewing_Filtering_and_Grouping_Results.html

https://www.jetbrains.com/decompiler/

dotPeek is a free tool based on ReSharper. It can reliably decompile any .NET assembly into C# or IL code.

https://www.jetbrains.com/help/decompiler/Navigation_and_Search__Bookmarks.html