Problem with getting all users

I am trying to create a dropdown of usernames in a membership system. It is so the administrator can remove users by selecting their username and clicking delete. When I got the the asp configuration option it only shows one users. However if I select username from aspnet_users there are still like 5 users in there. I tried deleting them with the membership.deleteuser(user.identity.name, true) function and the aspnet configuraiton sees them as gone but they are still in that table. Does anyone know why and how I can get the all of the current users binded to a dropdown? Thanks
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