As compared to this:

Are these the best examples for C++ memory mapped files and rapid in memory processing? | Technical forum | Forum – See more at: http://quantlabs.net/academy/forum/technical-forum/are-these-the-best-examples-for-c-memory-mapped-files-and-rapid-in-memory-processing/#p527

Here are best examples or tutorial to do the equivalent in c#

http://msdn.microsoft.com/en-us/library/dd997372(v=vs.110).aspx
http://msdn.microsoft.com/enus/library/system.io.memorymappedfiles.memorymappedfile(v=vs.110).aspx
http://www.codeproject.com/Articles/138290/Programming-Memory-Mapped-Files-with-the-NET-Frame
http://www.codeproject.com/Articles/138290/Programming-Memory-Mapped-Files-with-the-NET-Framehttp://www.codeproject.com/Articles/467600/Memory-Mapped-File-Interoperability-with-NET-Objec
http://stackoverflow.com/questions/8968730/handling-memory-mapped-file-in-c-sharp-directly-from-the-memory
http://stackoverflow.com/questions/4017660/c-sharp-memory-mapped-file-read
http://www.ramsmusings.com/2013/11/12/memory-mapped-files-with-c/

Inter-Process Communication with Memory-Mapped Files, Part 01: transfer a data structure and an object
http://www.c-sharpcorner.com/UploadFile/b942f9/using-memory-mapped-files/

Now this comes to performance between c# and c++
http://www.codeproject.com/Articles/212856/Head-to-head-benchmark-Csharp-vs-NET