Role,Membership and profile management

 hello all ,
could u please help me please i doing project in that i had used sql role,membership and profile management  on sql server 2005 using aspnet_regsql.exe utility but problem is that whenever  i run my application  ASPNETDB.MDF this database arrive automatically in my app_Data folder so how i can prevent to creating ASPNETDB.MDF this databse i don't want this database so please help me
 
Thank You
Manoj Ambar 
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