It's not epi-related, but asp.net related and you can do just that (changing in database) https://stackoverflow.com/questions/1001491/is-it-possible-to-change-the-username-with-the-membership-api
We usually recommend against direct database access but when you really need it, and if you are very very careful, we can't stop you
I want to change the UserName but its read only.
how would you do it? The things i have tested