How to retrieve account names from UserProfile

It is quite difficult to get accountnames from userprofile database. Using SDK, you can get the account by following example

using (SPSite site = new SPSite(http://portal/))
{
        ServerContext context = ServerContext.GetContext(site);
        UserProfileManager profileManager = new UserProfileManager(context);

        foreach (UserProfile profile in profileManager)
       {
             Console.WriteLine(profile[PropertyConstants.AccountName]);
       }
}