Gets a value indicating whether an e-mail address stored on the Active Directory server must be unique.
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When the ActiveDirectoryMembershipProvider.RequiresUniqueEmail property is true, the System.Web.Security.ActiveDirectoryMembershipProvider instance ensures that the e-mail address is not used by any other user within the current scope when either the ActiveDirectoryMembershipProvider.CreateUser(string, string, string, string, string, bool, object, MembershipCreateStatus@) or ActiveDirectoryMembershipProvider.UpdateUser(MembershipUser) method is called.
The ActiveDirectoryMembershipProvider.RequiresUniqueEmail property is set in your application's configuration file using the requiresUniqueEmail attribute of the membership element. If the property is not set in the application's configuration file, the ActiveDirectoryMembershipProvider.RequiresUniqueEmail property is set to the default value of false.