gridview cell values

Question

what is wrong with code
every time i am getting null value
 Dim id As String = GridView1.Rows(0).Cells(1).Text

Request Slip No	BO ID	BO NAME	SHOLDER	THOLDER	CREATED DATE	CREATED BY	LIST UPDATE DATE	LIST UPDATE BY	DELETED INDEX	REMARKS
99960	1201200000018570	N ITIN BALKRISHNA BHATKAR			5/5/2011 11:55:10 AM	SHILPA	5/5/2011 11:55:10 AM	SHILPA	1	MAYUR
99960	1201200000018570	N ITIN BALKRISHNA BHATKAR			5/5/2011 11:55:10 AM	SHILPA	5/5/2011 11:55:10 AM	SHILPA	1	MAYUR