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hi all,

how to auto calculate days that key in by user.i want it to auto calculate whenever they just select the date from ajax calendar extender.

the program is actually allow user key in their task which is given by boss.there are textbox which receive start date, due date. the diff is between current date and due if the diff days is greater than due date then i will display indicator in red color.if the diff date is still in period task, then the indicator will show green color.

thanks in advance
Updated 8-Jul-12 19:05pm

1 solution

How do you expect that to work?
Diff = end - start
if (diff > end) RED

Since you are using the end data to calculate the difference, there is no point in comparing it to the end date because it cannot be anything other than on the end date...
musiw 9-Jul-12 2:02am
i dont know how to code it.lets say if i want to know the diff between start date and due to code it?especially when im using ajax calendar extender.
OriginalGriff 9-Jul-12 2:13am
Depends on where you are calculating it. Your question title says "C#" so I'll give you that:

DateTime endDate = DateTime.Parse(textboxEndDate.Text);
DateTime startDate = DateTime.Parse(textboxStartDate.Text);
TimeSpan diff = endDate - startDate;
double daysBetween = diff.TotalDays;
musiw 9-Jul-12 3:45am
ok.i already try your code.but it calculate wrong answer. let say i pick from 7/4/2012 end 7/10/2012 it become 183. i just want diff on days not month and year.
OriginalGriff 9-Jul-12 4:01am
Ah. That's not the fault of the code - it's an internationalization problem. There are 183 days between 7th April 2012 and 7th October 2012. I suspect you need to use the Calender.SelectedDate property instead...
musiw 9-Jul-12 4:22am
DateTime endDate = DateTime.Parse(TextBox4_CalendarExtender.SelectedDate.ToString());
DateTime startDate = DateTime.Parse(TextBox3_CalendarExtender.SelectedDate.ToString());
TimeSpan diff = endDate - startDate;
double daysBetween = diff.TotalDays;
Label13.Text = daysBetween.ToString();

error appear - >> String was not recognized as a valid DateTime.
OriginalGriff 9-Jul-12 4:27am
Calendar.SelectedDate is already a DateTime - you don't need to convert it to a string, or parse that string afterwards...

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