/// <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.v201306.CustomFieldService);

              // Sets defaults for page and filter.
              CustomFieldPage page = new CustomFieldPage();
              Statement filterStatement = new Statement();
              int offset = 0;

              try {
            do {
              // Create a statement to get all custom fields.
              filterStatement.query = "LIMIT 500 OFFSET " + offset;

              // Get custom fields by statement.
              page = customFieldService.getCustomFieldsByStatement(filterStatement);

              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++;
            }
              }

              offset += 500;
            } while (page.results != null && page.results.Length == 500);

            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.v201306.CustomFieldService);

              // Create statement to select only custom fields that apply to line items.
              String statementText = "WHERE entityType = :entityType LIMIT 500";
              Statement filterStatement = new StatementBuilder(statementText)
              .AddValue("entityType", CustomFieldEntityType.LINE_ITEM.ToString())
              .ToStatement();

              // Set defaults for page and offset.
              CustomFieldPage page = new CustomFieldPage();
              int offset = 0;
              int i = 0;

              try {
            do {
              // Create a statement to page through custom fields.
              filterStatement.query = statementText + " OFFSET " + offset;

              // Get custom fields by statement.
              page = customFieldService.getCustomFieldsByStatement(filterStatement);

              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++;
            }
              }
              offset += 500;
            } while (offset < 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.v201306.CustomFieldService);

      // Create statement to select only active custom fields that apply to
      // line items.
      String statementText = "WHERE entityType = :entityType and isActive = :isActive LIMIT 500";
      Statement filterStatement = new StatementBuilder(statementText)
              .AddValue("entityType", CustomFieldEntityType.LINE_ITEM.ToString())
              .AddValue("isActive", true)
              .ToStatement();

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

      try {
        do {
          // Create a statement to page through custom fields.
          filterStatement.query = statementText + " OFFSET " + offset;

          // Get custom fields by statement.
          page = customFieldService.getCustomFieldsByStatement(filterStatement);

          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++;
            }
          }
          offset += 500;
        } while (offset < page.totalResultSetSize);

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

        if (customFieldIds.Count > 0) {
          // Modify statement for action.
          filterStatement.query = "WHERE id IN (" + string.Join(", ", customFieldIds.ToArray()) +
              ")";

          // Create action.
          DeactivateCustomFields action = new DeactivateCustomFields();

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

          // 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);
      }
    }