-- Label
Private Sub GV1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GV1.RowDataBound
    If e.Row.RowType = DataControlRowType.DataRow Then
        Response.Write(DirectCast(e.Row.FindControl("Label1"), Label).Text)
    End If
End Sub

-- TextBox
Private Sub GV1_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles GV1.RowUpdating
    Response.Write(DirectCast(GV1.Rows(e.RowIndex).FindControl("TextBox1"), TextBox).Text)
End Sub