i am working with Nhibernate,c# and asp.net

Is there any way to find out the mapping file ( "hbm.xml" )exist for
(" cs file " ) or not

in my project there are many class (" cs file " )

i need to find out of mapping file ( "hbm.xml" ) of

every class (" cs file " )

For example
there is one class name ( customer.cs )
how can one tell about its mapping exist or not ???