Hi,
i want the user to be able to select null value from datetimepicker. i found that by using showcheckbox = true, i can control whether user needs to input value or not.

the problem is that i am using a validation, whereby
if the checkbox is not checked than it datetimepicker.value = ""
but it is giving me an error

please help with this

thanks

You are setting it to blank "" which is not a date. You need to set it to null.
It would be useful if you posted the exact error message you are getting.

1. Bind your datetimepicker.text, not datetimepicker.value
2. Add this code in datetimepicker_Validating(object sender, CancelEventArgs e) event:

if (!datetimepicker.Checked)
((Order)orderBindingSource.Current).OrderDate= null;

I hope it works in your case