c# - Setting DateTimePicker to Null and saving to DB -

i having issues datetimepicker. have followed examples setting datetimepicker blank. code looks this:

dtpclosedate.checked = false; dtpclosedate.showcheckbox = false;  if (dtpclosedate.checked == false) {     dtpclosedate.customformat = " ";     dtpclosedate.format = datetimepickerformat.custom; } 

so works great when loaded datetimepicker loads blank in there. however, behind scenes there date being loaded this. save db , has date. plus trying validate close date after open date. have validation, triggered because there date in close date apparently before open date.

maybe this:

dtpclosedate.checked = false; dtpclosedate.showcheckbox = false;  if (dtpclosedate.checked == false) {     dtpclosedate.customformat = " ";     dtpclosedate.format = datetimepickerformat.custom;     dtpclosedate.value = datetime.minvalue; } 

to set date absolute zero. test when loading/saving database/doing whatever wanna do:

if (dtp.value == datetime.minvalue) { ... }