Unique email addresses between multiple membership providers

Hey,

We use a little bit different approach for user logon - they provide email address (instead of username) and password  (to simplify: email address is username).

We ​have also Ldap membership provider enabled and we allow ldap
users to login on the front-end. Everything works fine, but admin users
can create accounts in the backend (Sitefinity admin), and we need to
restrict email addresses to be unique (in other words: admin cannot
create a new user with email address that exists for Ldap user). We implemented this on the front-end by checking with LdapMembershipProvider if provided email address exists, if not then we call CreateUser on UserManager, but we cannot ​add any custom validation ​in Sitefinity backend to create user form.

Is there any possibility to achieve this ?

Thank you,

Albert

Hello Albert,

In order to achieve your need you can set the username and the nickname as the user's e-mail address.

In that case users with one and the same e-mail could not be created in any membership provider.

Regards,
Svetoslav Manchev
Telerik