save 0000-00-00 date in mysql

can you help me?
below is the value for my date when it is saved ... my problem is when i save the null value ..error says argument prompt cannot be converted to string..

how about if i'll save
dim s as date ="0000-00-00"
tblEmpCRow("dateterminated") =s
instead of
tblEmpCRow("dateterminated") = DBNull.Value

Code:

---

     
      If dtpTerm.Checked Then
            tblEmpCRow("dateterminated") = dtpTerm.Value
            txtTerm.Text = dtpTerm.Text
        Else
           
            tblEmpCRow("dateterminated") = DBNull.Value
            txtTerm.Text = ""
        End If

---

To save a dummy value in place of NULL is a bad practice.

Instead of doing it, write code to handle the NULL values when you are reading the dates from the table and assigning them to your controls.

.