poupou@pollux:~/src/bugzilla> cat ex.cs
using System;

class Program {

        static int Main (string[] args)
        {
                if (args.Length == 0)
                        return 42;
                else
                        return 0;
        }
}
poupou@pollux:~/src/bugzilla> monodis ex.exe
.assembly extern mscorlib
{
  .ver 1:0:5000:0
  .publickeytoken = (B7 7A 5C 56 19 34 E0 89 ) // .z\V.4..
}
.assembly 'ex'
{
  .hash algorithm 0x00008004
  .ver  0:0:0:0
}
.module ex.exe // GUID = {5B8B943A-92CC-4AFA-B39E-369EA6A18B0A}


  .class private auto ansi beforefieldinit Program
        extends [mscorlib]System.Object
  {

    // method line 1
    .method public hidebysig  specialname  rtspecialname
           instance default void .ctor ()  cil managed
    {
        // Method begins at RVA 0x20ec
        // Code size 7 (0x7)
        .maxstack 8
        IL_0000:  ldarg.0
        IL_0001:  call instance void object::.ctor()
        IL_0006:  ret
    } // end of method Program::.ctor

    // method line 2
    .method private static  hidebysig
           default int32 Main (string[] args)  cil managed
    {
        // Method begins at RVA 0x20f4
        .entrypoint
        // Code size 13 (0xd)
        .maxstack 8
        IL_0000:  ldarg.0
        IL_0001:  ldlen
        IL_0002:  conv.i4
        IL_0003:  brtrue IL_000b

        IL_0008:  ldc.i4.s 0x2a
        IL_000a:  ret
        IL_000b:  ldc.i4.0
        IL_000c:  ret
    } // end of method Program::Main

  } // end of class Program