网络上使用的日历系统开发库，实现RFC2445的标准，提供最高等级的应用
其实在 Outlook 中，当您收到来自 Outlook 用户的会议要求时，该会议要求可能以邮件的形式出现，邮件正文所包含的文本代表 iCalendar 数据。
DDay.iCal is an iCalendar class library (also known as RFC2445) for .NET 2.0 and above. It's aimed at providing full RFC 2445 compliance, while providing the highest level of compatibility with popular calendaring applications.
Adding iCalendar support to your program