如何cpmpare两个日期日期当前日期和最大日期........ plzz帮帮我

查看 DateTime.Subtract方法，以获取两个源日期之间的时间跨度，以便您可以单独分析每个日期/时间组件(年，日，分钟，...).

Look at DateTime.Compare Method for straight compare method, or
DateTime.Subtract Method to get a time-span between the two source dates, so that you can analyze every date/time component by itself (year, day, minute, ...).

DateTime srtdate = Convert.ToDateTime(allitem ["StartDate"].Text.ToString() );
DateTime srtdate = Convert.ToDateTime(allitem ["StartDate"].Text.ToString());

(DateTime.Now.ToShortDateString()> = srtdate.ToShortDateString())

开始日期-2012年2月22日和结束日期-2012年2月22日
if(((DateTime.Today> = strdate.Date)&&(DateTime.Today< = enddate.Date))
lblCondition.Text =已检查";

这样，您就可以比较两个日期

DateTime srtdate = Convert.ToDateTime(allitem["StartDate"].Text.ToString());
DateTime srtdate = Convert.ToDateTime(allitem["StartDate"].Text.ToString());

(DateTime.Now.ToShortDateString() >= srtdate.ToShortDateString())

Start Date - 22-Feb-2012 AND End Date - 22-Feb-2012
if ((DateTime.Today >= strdate.Date) && (DateTime.Today <= enddate.Date))
lblCondition.Text = "CHECKED";

this Way u Can compare two dates

意味着什么，输入内容不应大于当前日期?或比较两个日期值?

Means what , input should not be greater than current date? or compare two dates value?