Question

How to set UserPrincipalName attribute
when default provider is AspNetActiveDirectoryMembershipProvider.

Following is the list of CreateUser methods of System.Web.Security.Membership

public static MembershipUser CreateUser(string username, string password);
public static MembershipUser CreateUser(string username, string password, string email);
public static MembershipUser CreateUser(string username, string password, string email, string passwordQuestion, string passwordAnswer, bool isApproved, out MembershipCreateStatus status);
public static MembershipUser CreateUser(string username, string password, string email, string passwordQuestion, string passwordAnswer, bool isApproved, object providerUserKey, out MembershipCreateStatus status);

Answer 1

According to the ActiveDirectoryMembershipProvider MSDN documentation, the UserNameproperty are mapped to the userPrincipalName attribute.