Microsoft .NET CLI Disassembler. VisualBasic library

conv.i8
    mul.ovf
    stloc.0
    ldarg.0
    ldfld    class [mscorlib]System.IO.FileStream Microsoft.VisualBasic.CompilerServices.VB6File::m_file
    ldloc.1
    ldloc.0
    callvirt instance void [mscorlib]System.IO.FileStream::Lock(int64, int64)
    ret
  }

  .method public hidebysig virtual instance void Unlock(int64 lStart, int64 lEnd)
  {
    .maxstack 3
    .locals init (int64 V0,
                  int64 V1)
    ldarg.1
    ldarg.2
    ble.s    loc_439
    ldstr    aArgumentInvali            // "Argument_InvalidValue1"
    ldstr    aStart                     // "Start"
    call     string Microsoft.VisualBasic.CompilerServices.Utils::GetResourceString(string ResourceKey, string Parm1)
    newobj   instance void [mscorlib]System.ArgumentException::.ctor(string)
    throw

loc_439:                                // CODE XREF: Microsoft.VisualBasic.CompilerServices.VB6RandomFile__Unlock+2↑j
    ldarg.1
    ldc.i8   1
    sub.ovf
    ldarg.0
    ldfld    int32 Microsoft.VisualBasic.CompilerServices.VB6File::m_lRecordLen
    conv.i8
    mul.ovf
    stloc.1
    ldarg.2