How to set empty RadDatePicker to null?

[Jerald]

I need to insert "null" into the database when a raddatepicker is empty.  How is this accomplished? I use the following parameter for textboxes and it works just fine:

newDocCmd.Parameters.AddWithValue("@docReason", !string.IsNullOrEmpty(docReasonTextBox.Text) ? docReasonTextBox.Text : (object)DBNull.Value);

 

If I try the same for the raddatepicker I get the expected error of "cannot convert from 'object' to 'string'":

newDocCmd.Parameters.AddWithValue("@docSubDt", !string.IsNullOrEmpty(rdpSubDt.DbSelectedDate) ? rdpSubDt.DbSelectedDate : (object)DBNull.Value);

[Jerald]

Please disregard - apparently I'm having another senior moment.  This works:

newDocCmd.Parameters.AddWithValue("@docSubDt", rdpSubDt.SelectedDate ?? (object)DBNull.Value);