/// <summary>
 /// List all of the people in the specified collection for a particular activity.
 /// </summary>
 /// <param name="activityId"></param>
 /// <param name="access"></param>
 /// <param name="collection">"plusoners": List all people who have +1'd this activity OR "resharers": List all people who have reshared this activity.</param>
 /// <returns></returns>
 public JArray GetPeopleListByActivity(string activityId, string access, string collection)
 {
     People objPeople = new People();
     try
     {
         objArr = objPeople.Get_People_ListByActivity(activityId, access, collection);
     }
     catch (Exception Err)
     {
         Console.Write(Err.StackTrace);
     }
     return objArr;
 }