(1) CSC.exe position
[Situated 4.0]
C: \ Windows \ Microsoft.NET \ Framework \ v4.0.30319
[After version is located]
C:\Program Files (x86)\MSBuild\12.0\Bin
C:\Program Files (x86)\MSBuild\14.0\Bin
(2)CSC.rsp
CSC.rsp file defines the default switch, located in the same folder