如何用c#编辑或删除Google日历中的约会

我只是想知道是否存在一种方法来编辑或删除Google日历中的约会，我使用Lightswitch来创建约会，像这样:

public void SendAppointment()
{
    try
    {
        MailMessage msg = new MailMessage();
        SmtpClient sc = new SmtpClient("smtp.gmail.com", 587);
        msg.From = new MailAddress("no-reply@email.com", "NEW EVENT");
        sc.Credentials = new NetworkCredential("no-reply@email.com", "password");
        sc.EnableSsl = true;
        msg.To.Add(new MailAddress("invited@mail.com", "Invited"));
        msg.Subject = "Subject";
        msg.Body = "YOUR CONTENT";
        StringBuilder str = new StringBuilder();
        str.AppendLine("BEGIN:VCALENDAR");
        str.AppendLine("PRODID:-//GeO");
        str.AppendLine("VERSION:2.0");
        str.AppendLine("METHOD:REQUEST");
        str.AppendLine("BEGIN:VEVENT");
        str.AppendLine(string.Format("DTSTART:{0:yyyyMMddTHHmmssZ}", START_DATE));
        str.AppendLine(string.Format("DTSTAMP:{0:yyyyMMddTHHmmssZ}", DateTime.UtcNow));
        str.AppendLine(string.Format("DTEND:{0:yyyyMMddTHHmmssZ}", END_DATE));
        str.AppendLine("LOCATION: " + Direccion);
        str.AppendLine(string.Format("UID:{0}", Guid.NewGuid()));
        //str.AppendLine(string.Format("DESCRIPTION:{0}", msg.Body));
        str.AppendLine(string.Format("DESCRIPTION;ENCODING=QUOTED-PRINTABLE:{0}", msg.Body));
        str.AppendLine(string.Format("X-ALT-DESC;FMTTYPE=text/html:{0}", msg.Body));
        str.AppendLine(string.Format("SUMMARY;ENCODING=QUOTED-PRINTABLE:{0}", msg.Subject));
        str.AppendLine(string.Format("ORGANIZER:MAILTO:{0}", msg.From.Address));
        str.AppendLine(string.Format("ATTENDEE;CN='"{0}'";RSVP=TRUE:mailto:{1}", msg.To[0].DisplayName, msg.To[0].Address));
        str.AppendLine("BEGIN:VALARM");
        str.AppendLine("TRIGGER:-PT15M");
        str.AppendLine("ACTION:DISPLAY");
        str.AppendLine("DESCRIPTION;ENCODING=QUOTED-PRINTABLE:Reminder");
        str.AppendLine("END:VALARM");
        str.AppendLine("END:VEVENT");
        str.AppendLine("END:VCALENDAR");
        System.Net.Mime.ContentType type = new System.Net.Mime.ContentType("text/calendar");
        type.Parameters.Add("method", "REQUEST");
        //type.Parameters.Add("method", "PUBLISH");
        type.Parameters.Add("name", "Cita.ics");
        msg.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(str.ToString(), type));
        sc.Send(msg);
    }
    catch (Exception e)
    {
        throw e;
    }
}

我真的不知道如何在谷歌日历中获得特定的事件，有人可以指导我正确的方式吗?