I have come up with a solution that works for me when binding a plain RadDateTimePicker to a .net Binding Source. My full post is here.
http://www.telerik.com/community/forums/winforms/calendar-and-datetimepicker/raddatepicker-and-null-values.aspx#1747985
By modifying the default control set up:
- A Null value is translated in and out without error.
- Today's date is given focus when the calendar opens
- The display text is blank when users press delete, or a null is in the data source
I Set the DataBinding NullValue to Today 12:00:01 AM :
Then I set the DateTimePicker NullDate to Today 12:00:01 AM, and Value to Today 12:00:00 AM.