Question

If a user is removed from AD, the user still exists in sharepoint. Now i want to check if a user exists in AD, so is there any sharepoint object model can do this?

Thanks in advance.

Answer 1

If the user is in the domain user Group, it collects all users under that user group and loops the list to that try to find the current user. If a user is found, it returns true, otherwise returns false.

Check this article Check Whether User Exists in Active Directory that include some security related issues to achieve the requirement.

// Get ad users in the groups. Since MOSS does
                    // not support nested groups
                    // this will always be a collection of AD users
                    // and groups
                    foreach (SPUser user in group.Users)
                    {
                        // Check if this is a Group
                        if (!user.IsDomainGroup)
                        {
                            // Verify if the user name matches the user name in group
                            if (user.LoginName.ToUpper().Equals(upperCaseUserName))
                            {
                                // if a match is confirmed, return from the method.
                                // There is no need to continue
                                userIsInGroup = true;
                                return; 
                            }
                        }
                        else {
                        // If the AD entity is a User Group,
                        // then check for users in that group
                        if (IsUserInADGroup(web, user.LoginName, 
                            username, out reachedMax))
                        {
                            userIsInGroup = true;
                            return;
                        }
                    }

Hope this help..