If using DbSelectedDate
the application should not throw an exception if the new value is null or DBNull. Setting a null value should internally revert the SelectedDate to the null value, i.e. the input value will be empty.
Therefore, we would need more details in order to locate the cause of the issue. Can you provide us with a set of steps to follow in order to create a project replicating the erroneous behavior?
the Telerik team