Vista - Save Data Field in an Access database

I'm trying to save a Date into an Access database. I'm using a dataset
with only one table, and that table has only two fields: a string and
a date field.
My code is similar to this:

strValue = "my string content"
dateValue = #01/31/2008#
newRow = myDatatable.NewRow()
newRow.BeginEdit()
newRow("StringField") = strValue
newRow("DateField") = dateValue
myDatatable.Rows.Add(newRow)
newRow.EndEdit()
myDataAdapter.Update(myDataTable)


in my Access database only is save the string field but not the data
field.

What I am doing wrong?

Thanks to everybody