ASP.NET 时间比较

Convert.ToDateTime(vote.InfoTime.ToString()).CompareTo(DateTime.Now.AddMinutes(-3)) == -1
或
Convert.ToDateTime(vote.InfoTime.ToString())<DateTime.Now.AddMinutes(-3)

DateTime time = ?;//发贴时间

if (time.AddMinutes(30) > DateTime.Now){//超过半小时} else {//未超过半小时}