Do we need to create different hbm files for every class.
Is there any way of using only single hbm file which can map to all the classes in different assemblies?
If anyone has sample demonstrating please show me ?

Thanks,
Suman Sajjana

Why can't you have one .hbm.xml-file for each assembly?

I use .hbm.xml mapping files to describe classes in other assemblies frequently. Nothing stops you from having a mapping file that services all assemblies. Just have multiple <class> tags in your .hbm.xml file, I believe. The tag would look like