How to get value the data in datagridview?

Question

Here is my data in datagridview:

ID_PRODUCT NAME DATE

============ ======= ====

BR001 A 11/10/2012

BR002 B 11/10/2012

BR003 C 13/10/2012

BR004 D 15/10/2012

and my textbox on vb.net contains of:

txtIDPRODUCT

txtNAME

Datetimepicker

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