Dataset updated ...but rowstate not

Hello,

I update a Dataset like this :
ds.Tables[0].Rows[dataNavigator1.Position]["MY_FIELD"] = textbox1.Text;

The content is really change. But the rowstate doesn't change then the
database is not update

Then before the database update, I have to go to the next record and go back
with the dataNavigator and after the database update works.

I tried to give the focus to an another textbox but no change.

Any idea ?



Thanks,