Why a Gridview control miss o dont show the row 0 of a Datareader ?

I write a simple webpage to get records from MS-SQL into a datareader.
verify the numbers of row with Fieldcount I check the numbers of rows are 3.
but when I use a Gridview to show data using :
GridView2.DataSource = dbDataReader2
GridView2.DataBind()

the row(0) is lost, Dataview if filled with only 2 rows (row(1), row(2)


Thanks for any advice.