I tried the code below, but now I am getting the error Specified argument was out of the range of valid values.
Parameter name: index?

Private Sub GridView1_RowCommand(sender As Object, e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand
        For Each dr In GridView1.Rows
            If e.CommandName = "Select" Then
                Dim index As Integer = Convert.ToString(e.CommandArgument)
                Dim row As GridViewRow = GridView1.Rows(index)
                Me.NameTextBox.Text = Server.HtmlDecode(row.Cells(1).Text)
                Me.Product1DropDown.SelectedValue = Server.HtmlDecode(row.Cells(2).Text)
                Me.Product2DropDown.SelectedValue = Server.HtmlDecode(row.Cells(3).Text)
                Me.JobNumberTextBox.Text = Server.HtmlDecode(row.Cells(4).Text)
                Me.AdTextBox.Text = Server.HtmlDecode(row.Cells(5).Text)
                Me.MediaTypeDropDown.SelectedValue = Server.HtmlDecode(row.Cells(6).Text)
                Me.AuthorDropDown.SelectedValue = Server.HtmlDecode(row.Cells(7).Text)
                Me.PublicationDropDown.SelectedValue = Server.HtmlDecode(row.Cells(8).Text)
                Me.RunDatesTextBox.Text = Server.HtmlDecode(row.Cells(9).Text)
                Me.CostTextBox.Text = Server.HtmlDecode(row.Cells(10).Text)
                Me.CostCenterTextBox.Text = Server.HtmlDecode(row.Cells(11).Text)

                Dim myHyperLink As String = GridView1.DataKeys(dr.RowIndex)("PDFFile")

                '  do something for each row in the gridview.
                Me.HyperLink1.Text = myHyperLink
                Me.HyperLink1.NavigateUrl = CType((row.Cells(13).Controls(13)), HyperLink).Text

                Me.CommentsTextBox.Text = Server.HtmlDecode(row.Cells(12).Text)
                Me.TextBox1.Text = Server.HtmlDecode(row.Cells(14).Text)
                Label14.Text = "Update"
            End If
        Next
    End Sub