/// <summary>
    /// Runs the code example.
    /// </summary>
    /// <param name="user">The AdWords user.</param>
    /// <param name="campaignId">Id of the campaign for which ad groups are
    /// retrieved.</param>
    public void Run(AdWordsUser user, long campaignId) {
      // Get the AdGroupService.
      AdGroupService adGroupService =
          (AdGroupService) user.GetService(AdWordsService.v201506.AdGroupService);

      // Create the selector.
      Selector selector = new Selector();
      selector.fields = new string[] {"Id", "Name"};

      // Create the filters.
      Predicate predicate = new Predicate();
      predicate.field = "CampaignId";
      predicate.@operator = PredicateOperator.EQUALS;
      predicate.values = new string[] {campaignId.ToString()};
      selector.predicates = new Predicate[] {predicate};

      // Set the selector paging.
      selector.paging = new Paging();

      int offset = 0;
      int pageSize = 500;

      AdGroupPage page = new AdGroupPage();

      try {
        do {
          selector.paging.startIndex = offset;
          selector.paging.numberResults = pageSize;

          // Get the ad groups.
          page = adGroupService.get(selector);

          // Display the results.
          if (page != null && page.entries != null) {
            int i = offset;
            foreach (AdGroup adGroup in page.entries) {
              Console.WriteLine("{0}) Ad group name is '{1}' and id is {2}.", i + 1, adGroup.name,
                  adGroup.id);
              i++;
            }
          }
          offset += pageSize;
        } while (offset < page.totalNumEntries);
        Console.WriteLine("Number of ad groups found: {0}", page.totalNumEntries);
      } catch (Exception ex) {
        throw new System.ApplicationException("Failed to retrieve ad groups.", ex);
      }
    }
    /// <summary>
    /// Runs the code example.
    /// </summary>
    /// <param name="user">The AdWords user.</param>
    /// <param name="campaignId">Id of the campaign for which ad groups are
    /// retrieved.</param>
    public void Run(AdWordsUser user, long campaignId) {
      // Get the AdGroupService.
      AdGroupService adGroupService =
          (AdGroupService) user.GetService(AdWordsService.v201506.AdGroupService);

      // Create the selector.
      Selector selector = new Selector() {
        fields = new string[] { AdGroup.Fields.Id, AdGroup.Fields.Name },
        predicates = new Predicate[] {
          Predicate.Equals(AdGroup.Fields.CampaignId, campaignId)
        },
        paging = Paging.Default,
        ordering = new OrderBy[] {OrderBy.Asc(AdGroup.Fields.Name)}
      };

      AdGroupPage page = new AdGroupPage();

      try {
        do {
          // Get the ad groups.
          page = adGroupService.get(selector);

          // Display the results.
          if (page != null && page.entries != null) {
            int i = selector.paging.startIndex;
            foreach (AdGroup adGroup in page.entries) {
              Console.WriteLine("{0}) Ad group name is '{1}' and id is {2}.", i + 1, adGroup.name,
                  adGroup.id);
              i++;
            }
          }
          // Note: You can also use selector.paging.IncrementOffsetBy(customPageSize)
          selector.paging.IncreaseOffset();
        } while (selector.paging.startIndex < page.totalNumEntries);
        Console.WriteLine("Number of ad groups found: {0}", page.totalNumEntries);
      } catch (Exception e) {
        throw new System.ApplicationException("Failed to retrieve ad groups.", e);
      }
    }