/// <summary>
 /// Gets users
 /// </summary>
 /// <param name="samAccountName"></param>
 /// <param name="displayName"></param>
 /// <param name="userPrincipals"></param>
 public static void GetUser(string samAccountName, string displayName, XElement userPrincipals)
 {
     foreach (UserPrincipal userPrincipal in (IEnumerable <UserPrincipal>)ActiveDirectoryUser.Get(samAccountName, displayName))
     {
         userPrincipals.Add((object)ActiveDirectoryUser.ToXElement(userPrincipal));
     }
 }