making an int field in a table null

hi guys!

i have a windows form named form1 and a tblEmp with the following fields;

id int, Fname text, Lname text, Dob datetimepicker and age int

i also have on form1 two buttons Save and Retrieve and a textbox for searching by id #

the save button works fine, if i save a record with no age it saves and that's fine

but when i click the retrieve button;

the information come up which is great but age come up as 0;

in the table i made the age field (allow null)

can someone help me?

i tried age.text = "";

and it's still saving a 0 in the age field in the table.

i want the field to be blank when i click the retrieve button.