Problem in Getting the Data from Google Calender

I am trying to getting the data from google calender and display in my project, i downloaded the API for google calender and 
i added the references of required dll's
 and in my code i am getting this error where is the problem i am not getting 
Here it is my code
public class CalenderEventObject { public DateTime Date{get;set;} public String Title{get;set;} } public class GoogleCalender { private const string Calender_URL = "https://www.Google.com/calendar/feeds/default/owncalendars/full"; private const string Calender_Template = "https://www.Google.com/calendar/feeds/{0}/private/full"; private string m_CalenderUrl = null; private string m_CalenderId = null; private readonly CalendarService m_Service = null; private readonly string m_CalenderName; private readonly string m_U ...