wpf 4 datepicker property

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WPF

Please anyone tell me how to set wpf datepicker selected date as display startdate when user entering 1/1/0001 year.because sql support date between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM displaystartdate and displayenddate property.but it will not check if anyone type manually.