/// <summary>
    /// Run the code example.
    /// </summary>
    /// <param name="user">The DFP user object running the code example.</param>
    public override void Run(DfpUser user) {
      // Get the CustomFieldService.
      CustomFieldService customFieldService = (CustomFieldService) user.GetService(
          DfpService.v201408.CustomFieldService);

      // Create a statement to get all custom fields.
      StatementBuilder statementBuilder = new StatementBuilder()
          .OrderBy("id ASC")
          .Limit(StatementBuilder.SUGGESTED_PAGE_LIMIT);

      // Sets default for page.
      CustomFieldPage page = new CustomFieldPage();

      try {
        do {
          // Get custom fields by statement.
          page = customFieldService.getCustomFieldsByStatement(statementBuilder.ToStatement());

          if (page.results != null) {
            int i = page.startIndex;
            foreach (CustomField customField in page.results) {
              if (customField is DropDownCustomField) {
                List<String> dropDownCustomFieldStrings = new List<String>();
                DropDownCustomField dropDownCustomField = (DropDownCustomField) customField;
                if (dropDownCustomField.options != null) {
                  foreach (CustomFieldOption customFieldOption in dropDownCustomField.options) {
                    dropDownCustomFieldStrings.Add(customFieldOption.displayName);
                  }
                }
                Console.WriteLine("{0}) Drop-down custom field with ID \"{1}\", name \"{2}\", " +
                    "and options {{{3}}} was found.", i, customField.id, customField.name,
                    string.Join(", ", dropDownCustomFieldStrings.ToArray()));
              } else {
                Console.WriteLine("{0}) Custom field with ID \"{1}\" and  name \"{2}\" was found.",
                    i, customField.id, customField.name);
              }
              i++;
            }
          }

          statementBuilder.IncreaseOffsetBy(StatementBuilder.SUGGESTED_PAGE_LIMIT);
        } while (statementBuilder.GetOffset() < page.totalResultSetSize);

        Console.WriteLine("Number of results found: " + page.totalResultSetSize);
      } catch (Exception ex) {
        Console.WriteLine("Failed to get all custom fields. Exception says \"{0}\"", ex.Message);
      }
    }
    /// <summary>
    /// Run the code example.
    /// </summary>
    /// <param name="user">The DFP user object running the code example.</param>
    public override void Run(DfpUser user) {
      // Get the CustomFieldService.
      CustomFieldService customFieldService = (CustomFieldService) user.GetService(
          DfpService.v201408.CustomFieldService);

      // Create statement to select only custom fields that apply to line items.
      StatementBuilder statementBuilder = new StatementBuilder()
          .Where("entityType = :entityType")
          .OrderBy("id ASC")
          .Limit(StatementBuilder.SUGGESTED_PAGE_LIMIT)
          .AddValue("entityType", CustomFieldEntityType.LINE_ITEM.ToString());

      // Set default for page.
      CustomFieldPage page = new CustomFieldPage();
      int i = 0;

      try {
        do {
          // Get custom fields by statement.
          page = customFieldService.getCustomFieldsByStatement(statementBuilder.ToStatement());

          if (page.results != null) {
            foreach (CustomField customField in page.results) {
              Console.WriteLine("{0}) Custom field with ID \"{1}\" and name \"{2}\" was found.", i,
                  customField.id, customField.name);
              i++;
            }
          }
          statementBuilder.IncreaseOffsetBy(StatementBuilder.SUGGESTED_PAGE_LIMIT);
        } while (statementBuilder.GetOffset() < page.totalResultSetSize);
        Console.WriteLine("Number of results found: {0}", page.totalResultSetSize);
      } catch (Exception ex) {
        Console.WriteLine("Failed to get all line item custom fields. Exception says \"{0}\"",
            ex.Message);
      }
    }
    /// <summary>
    /// Run the code example.
    /// </summary>
    /// <param name="user">The DFP user object running the code example.</param>
    public override void Run(DfpUser user) {
      // Get the CustomFieldService.
      CustomFieldService customFieldService = (CustomFieldService) user.GetService(
          DfpService.v201408.CustomFieldService);

      // Set the ID of the custom field to update.
      int customFieldId = int.Parse(_T("INSERT_CUSTOM_FIELD_ID_HERE"));

      // Create statement to select only active custom fields that apply to
      // line items.
      StatementBuilder statementBuilder = new StatementBuilder()
          .Where("id = :id")
          .OrderBy("id ASC")
          .Limit(1)
          .AddValue("id", customFieldId);

      // Set default for page.
      CustomFieldPage page = new CustomFieldPage();
      int i = 0;
      List<string> customFieldIds = new List<string>();

      try {
        do {
          // Get custom fields by statement.
          page = customFieldService.getCustomFieldsByStatement(statementBuilder.ToStatement());

          if (page.results != null) {
            foreach (CustomField customField in page.results) {
              Console.WriteLine("{0}) Custom field with ID \"{1}\" and name \"{2}\" will be " +
                  "deactivated.", i, customField.id, customField.name);
              customFieldIds.Add(customField.id.ToString());
              i++;
            }
          }
          statementBuilder.IncreaseOffsetBy(StatementBuilder.SUGGESTED_PAGE_LIMIT);
        } while (statementBuilder.GetOffset() < page.totalResultSetSize);

        Console.WriteLine("Number of custom fields to be deactivated: " + customFieldIds.Count);

        if (customFieldIds.Count > 0) {
          // Remove limit and offset from statement.
          statementBuilder.RemoveLimitAndOffset();

          // Create action.
          Google.Api.Ads.Dfp.v201408.DeactivateCustomFields action =
              new Google.Api.Ads.Dfp.v201408.DeactivateCustomFields();

          // Perform action.
          UpdateResult result = customFieldService.performCustomFieldAction(action,
              statementBuilder.ToStatement());

          // Display results.
          if (result != null && result.numChanges > 0) {
            Console.WriteLine("Number of custom fields deactivated: " + result.numChanges);
          } else {
            Console.WriteLine("No custom fields were deactivated.");
          }
        }
      } catch (Exception ex) {
        Console.WriteLine("Failed to deactivate custom fields. Exception says \"{0}\"", ex.Message);
      }
    }