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I am using Visual studio 2015. I think it uses the cl.exe compiler which is inside the Microsoft Visual Studio 14.0\VC\bin folder to compile C++ code. Also, my understanding is that the compiler used to compile C# code is csc.exe. However, I could not find this csc.exe inside my visual studio like cl.exe. I am curious to know how visual studio compiles C# code then. I think Visual Studio uses the csc.exe which comes with .Net, generally installed in C:\Windows\Microsoft.NET\Framework\\csc.exe to compile C# code. Is my understanding correct ?

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    I have just answer another question on this topic. Please check. Visual Studio 2015 uses the default Roslyn compiler, not the one shipped with .NET Framework. Commented Jun 20, 2018 at 3:45
  • Thanks, I went through the link. Inmycase, my visual studio 2015 does-not have Roslyn\csc.exe. Basically it does-not have csc.exe installed. So in this case, can we assume it is taking csc.exe from my .Net installation? Commented Jun 20, 2018 at 4:03
  • Did you install VS2015 or did someone else install it? Was the option to install C# unticked? Commented Jun 20, 2018 at 4:20

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I cannot answer why Roslyn is not present in your VS 2015 install dir. But you can examine how Visual Studio runs the csc.exe in the output window.

Go to Tools->Options->Projects and Solutions->Build and Run, and select the build output verbosity. (you can select the most verbose option)

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Then build your program. You can then check the command line used by MSBuild in the output window.

Something like, ooh, I am using VS 2017...

C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\15.0\Bin\Roslyn\csc.exe /noconfig /nowarn:1701,1702,2008 /nostdlib+ /platform:anycpu32bitpreferred ... (a bunch of switches omitted)

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Thanks got it, I see in mycase it is taking csc.exe from the following path -- C:\Program Files (x86)\MSBuild\14.0\bin\csc.exe

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