At what point is C# code compiled into intermediate bytecode?

In C#, the code is compiled into intermediate bytecode (IL — Intermediate Language) during the compilation of the source code in the build process. This occurs before the program runs, when the C# compiler (csc.exe) transforms the source code into IL, which is then packaged into an assembly (.dll or .exe). During execution, the CLR (Common Language Runtime) performs JIT compilation of IL into machine code specific to the platform.