Render method Not working in Sql server 2014 reporting service

I have migrated SQL server from 2005 to 2014 version along with the report server.

my application is rendering report file in pdf format using ReportServer reference.

so i have updated the reference also in application.

i have added new web reference in below format.

http://<Server Name>/ReportServer/ReportService2005.asmx

i am unable to use Render() method