BindingNavigatorAddNewItem - Default Value Is NOT WRITTEN To The Table

I have a question about the AddNewItem method. From what I understand, then this event occurs, the EndEdit() method is called and a new record is created IN MEMORY (or a buffer). The user fills in the form that is presented and when the Save button is pressed, the record in the buffer is actually added to the table.

In my application, a form is displayed and some of the forms databound text boxes have DEFAULT values (see the property for the textbox under the Data Bindings, Advanced and NULL VALUE). For example, I have a text box that holds a number and the NULL value is set to 0. When the form displays, the ZERO is in the text box. Assume the user NEVER enters the field or changes the ZERO to something else (which means the field is never validated).

Here is the problem. When the SAVE button is pressed, the ZERO that was the default value is NOT WRITTEN to the table. The field in the table is DBNULL. That is not the desired outcome. So - How can I check the fields in the BUFFER BEFORE they are written to the table?