URL-Rewriting(with out extension just want to display variable name)

Plz help me out in URL rewriting(Actually i have seen many sites and many solutions but that doesnt match with my requirements.
Actaully my requirement is
If i am on the www.somevent.com/Associations.aspx
and there are so many Associtaions i have with name and image If i click one of them image or link name then it should go to www.someevnt.com/AssociationName only
AssociationName is variable accordingly to the link
Actually i am using some approach but it didnt make any help to me still there is something which i have applied for that::------

I just added the following to web.config file and dll for that and there is u will see a regular expression which i have many permutaions and combinations to get that output but resource cant not be displayed problem occurs.
 
   
      true