how can i calculate age by datetimepicker
Possible Duplicate:
How do I calculate someone's age
How can i calculate age using datetimepicker in c#?
Strictly speaking,
TimeSpan age = DateTime.Now - dateTimePicker.Value;
However, figuring out someone's "age" is only slightly more complicated.
int years = DateTime.Now.Year - dateTimePicker.Value.Year;
if(dateTimePicker.Value.AddYears(years) > DateTime.Now) years--;
Because years vary in length you'll have to do this rather than relying on a structure like the TimeSpan that represents a specific amount of time (the same is true for figuring out how many "months" are between two dates, since months vary in length from 28-31 days).
The last line of code is there to account for the person's birthday not yet taking place this year.
假设DateTimePicker被称为dtpBirthday：
int age = DateTime.Now.Year - dtpBirthday.Value.Year - (DateTime.Now.DayOfYear < dtpBirthday.Value.DayOfYear ? 1 : 0);
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