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Lets say we have following sample code in C#: class BaseClass { public virtual void HelloWorld() { Console.WriteLine("Hello Tarik"); } } class DerivedClass : BaseClass { public override void HelloWorld() { base.HelloWorld(); } } class Program { static void Main(string[] args) { DerivedClass derived = new DerivedClass(); derived.HelloWorld(); } } When I ildasmed the following code: .method private hidebysig static void Main(string[] args) cil managed { .entrypoint // Code size 15 (0xf) .maxstack 1 .locals init ([0] class EnumReflection.DerivedClass derived) IL_0000: nop IL_0001: newobj instance void EnumReflection.DerivedClass::.ctor() IL_0006: stloc.0 IL_0007: ldloc.0 IL_0008: callvirt instance void EnumReflection.BaseClass::HelloWorld() IL_000d: nop IL_000e: ret } // end of method Program::Main However, csc.exe converted derived.HelloWorld(); --> callvirt instance void EnumReflection.BaseClass::HelloWorld() . Why is that? I didn't mention BaseClass anywhere in the Main method. And also if it is calling BaseClass::HelloWorld() then I would expect call instead of callvirt since it looks direct calling to BaseClass::HelloWorld() method.

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