Is SQL Server .Net application or C++ (VC++ windows SDK) application? My guess is definitely something Native so .Net code calling something native?
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When we install SQL Server it does not ask to install **.Net Framework** but all latest version of Windows have .Net installed by default. I recently did some programming (in C#) against SSIS engine and I saw following DLLs.

![enter image description here][1]


  [1]: http://i.stack.imgur.com/T2dqF.png

Now I could just refer this DLL in .Net project and start calling functionality from it... I did not needed to do any Inter-op. My understanding is this all are .Net DLLs SQL Server engine will also be using them so is it a .Net application?

I am looking for this information as I was wondering  for Performance we go for native (Windows SDK) as .Net Frameworks SDK comes with overhead for Stability and definitely Enterprise RDBMS needs to show performance.   