Question

How to navigate records w/ firstrecordbutton, previousbutton, nextbutton, lastrecordbutton

some of the codes, please help me fix it

Private Sub LastRecordButton_Click(sender As System.Object, e As System.EventArgs) Handles LastRecordButton.Click
recordNumber = (ds.Tables(0).Rows.Count) - 1

If recordNumber = (ds.Tables(0).Rows.Count) - 1 Then
ProductCodeTextBox.Text = ds.Tables(0).Rows(recordNumber)("ProductCode").ToString
DescriptionTextBox.Text = ds.Tables(0).Rows(recordNumber)("Product").ToString
QuantityTextBox.Text = ds.Tables(0).Rows(recordNumber)("QtyHand").ToString
SellingPriceTextBox.Text = ds.Tables(0).Rows(recordNumber)("SellingPrice").ToString
SupplierCodeTextBox.Text = ds.Tables(0).Rows(recordNumber)("SupplierCode").ToString
SupplierPriceTextBox.Text = ds.Tables(0).Rows(recordNumber)("SupplierPrice").ToString
CriticalLevelTextBox.Text = ds.Tables(0).Rows(recordNumber)("CriticalLevel").ToString