problem with binding dataset to textboxes

Question

Hi, i did a binding for a set of text boxes to a typed dataset.. every thing is just fine.. also, after I change the contents of a text box, the content of the typed dataset is also changes,, but the problem here is, the Row state is still unchanged, so when i call the Update method of a dataadapter passing the typed dataset to it after making some changes... nothing gets updated in the database... while the contents of the typed dataset is changed... what should i do??