想通过webservice 修改xml文件，在本地测试没问题，可是一放到服务器上就出错，是不是没写入权限？iis里的写入权限 选中了啊  提示错误如下：

Exception type: SoapException 
    Exception message: System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.UnauthorizedAccessException: Access to the path 'F:\...\...\...\...\gongfig.xml' is denied.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.File.Delete(String path)
   at Xol.Files.FileServiceXml.SetXml(String filePath, String xmlPath, String ids)
   --- End of inner exception stack trace ---
   at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
   at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
......................

   Stack trace:    at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
   at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)