/// <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.v201302.CustomFieldService);

              // Create custom fields.
              CustomField customField1 = new CustomField();
              customField1.name = "Customer comments #" + GetTimeStamp();
              customField1.entityType = CustomFieldEntityType.LINE_ITEM;
              customField1.dataType = CustomFieldDataType.STRING;
              customField1.visibility = CustomFieldVisibility.FULL;

              CustomField customField2 = new CustomField();
              customField2.name = "Internal approval status #" + GetTimeStamp();
              customField2.entityType = CustomFieldEntityType.LINE_ITEM;
              customField2.dataType = CustomFieldDataType.DROP_DOWN;
              customField2.visibility = CustomFieldVisibility.FULL;

              try {
            // Add custom fields.
            CustomField[] customFields =
            customFieldService.createCustomFields(new CustomField[] {customField1, customField2});

            // Display results.
            if (customFields != null) {
              foreach (CustomField customField in customFields) {
            Console.WriteLine("Custom field with ID \"{0}\" and name \"{1}\" was created.",
                customField.id, customField.name);
              }
            } else {
              Console.WriteLine("No custom fields created.");
            }
              } catch (Exception ex) {
            Console.WriteLine("Failed to create custom fields. Exception says \"{0}\"", ex.Message);
              }
        }
 public CustomField createCustomField(CustomField customField)
 {
     object[] results = this.Invoke("createCustomField", new object[] { customField });
       return ((CustomField) (results[0]));
 }