今天心血来潮用ildasm把.net的DLL文件反编译了。我要修改以下的代码(附后)   
IL_002a:  brfalse.s   IL_003f这行。问题是修改完之后用ilasm.exe无法编译成DLL。小弟第一玩.net 不是很懂。编译的时候提示warning -- Method has no body, 'ret' emitted。试过反编译完不做修改不也行。很是郁闷。哪位大虾帮帮忙，谢谢了。
可提供原版DLL文件，   快风了。。。

  .method public hidebysig specialname rtspecialname
          instance void  .ctor() cil managed
  {
    // Code size       74 (0x4a)
    .maxstack  2
    .locals init (bool V_0)
    IL_0000:  ldarg.0
    IL_0001:  call       instance void [System.Web.Services]System.Web.Services.Protocols.SoapHttpClientProtocol::.ctor()
    IL_0006:  nop
    IL_0007:  nop
    IL_0008:  ldarg.0
    IL_0009:  call       class Business.Properties.Settings Business.Properties.Settings::get_Default()
    IL_000e:  callvirt   instance string Business.Properties.Settings::get_Business_WebReg_Service()
    IL_0013:  call       instance void Business.WebReg.Service::set_Url(string)
    IL_0018:  nop
    IL_0019:  ldarg.0
    IL_001a:  ldarg.0
    IL_001b:  call       instance string Business.WebReg.Service::get_Url()
    IL_0020:  call       instance bool Business.WebReg.Service::IsLocalFileSystemWebService(string)
    IL_0025:  ldc.i4.0
    IL_0026:  ceq
    IL_0028:  stloc.0
    IL_0029:  ldloc.0
    IL_002a:  brfalse.s   IL_003f

    IL_002c:  nop
    IL_002d:  ldarg.0
    IL_002e:  ldc.i4.1
    IL_002f:  call       instance void Business.WebReg.Service::set_UseDefaultCredentials(bool)
    IL_0034:  nop
    IL_0035:  ldarg.0
    IL_0036:  ldc.i4.0
    IL_0037:  stfld      bool Business.WebReg.Service::useDefaultCredentialsSetExplicitly
    IL_003c:  nop
    IL_003d:  br.s       IL_0048

    IL_003f:  nop
    IL_0040:  ldarg.0
    IL_0041:  ldc.i4.1
    IL_0042:  stfld      bool Business.WebReg.Service::useDefaultCredentialsSetExplicitly
    IL_0047:  nop
    IL_0048:  nop
    IL_0049:  ret
  } // end of method Service::.ctor

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