I cannot understand what is wrong with the following code.  All I want
to do is to change certain values of a DateTime column during FormView
updating event.  Right now this event handler returns Null values to
the Database.  Looking for expert advice.

Protected Sub FormView1_ItemUpdating(ByVal sender As Object, ByVal e
As System.Web.UI.WebControls.FormViewUpdatedEventArgs) Handles
FormView1.ItemUpdated

       Dim PassOutYearDDL As DropDownList =
FormView1.FindControl("PassOutYearDDL")
       Dim PassOutDate1 As DateTime =
DateTime.ParseExact(PassOutYearDDL.SelectedValue.ToString, "yyyy",
Nothing)
       e.NewValues.Remove("PassOutYear")
       e.NewValues.Add("PassOutYear", PassOutDate1.ToString)

End Sub