转换:yyyyMMdd这样格式的字符串如何转datetime

C#,VB.net

yyyyMMdd这样格式的字符串如何转datetime:

App:
DateTime.ParseExact("20080808", "yyyyMMdd", Thread.CurrentThread.CurrentCulture)

Web:
DateTime.ParseExact(EventTimeHourStart, "yyyyMMdd", System.Globalization.CultureInfo.CurrentCulture)