Manage users and roles

 
Hi,
I am new to ASP.net. I am suppose to have security around a site where I should be able to manage the users and  roles. I do not want to use web administration tool because i would have to use that locally and if i want someone else to manage it for me, i can't do that. Is there any simple way where I can create my own web administration tool to manage the users and roles for my site?
 
...