ถามเรื่องการเพิ่มแถว กับการคำนวนราคาสินค้าจาก textbox ที่ clone ขึ้นมาครับผม

<table border="0">
  <tr>
    <td><table border="0" id="tblproduct">
      <tr>
        <td colspan="2" align="right" ><button id="addRow" type="button">+</button>
          &nbsp;
          <button id="removeRow" type="button">-</button></td>
      </tr>
      <tr id="trproduct">
        <td><label for="sum">กรุณาเลือกสินค้า</label></td>
        <td><select name="product" id="product">
          <?php $pro="select * from tblproduct";
			$qpro=mysql_query($pro);
			while($rs=mysql_fetch_array($qpro)){
			$proid=$rs['pid'];
			$name=$rs['pname'];
			$cost=$rs['cost'];
			echo "<option value= '$name'> $name </option>";} ?>
        </select></td>
      </tr>
    </table></td>
    <td><table id="tblamount">
      <tr>
        <td>ชื่อสินค้า</td>
        <td>จำนวน</td>
        <td>ราคา</td>
      </tr>
      <tr id="tramount">
        <td><input type="text" name="proname" id="proname" /></td>
        <td><input type="text" name="amount" id="amount" /></td>
        <td><input type="text" name="cost" id="cost" /></td>
      </tr>
      <tr>
        <td colspan="2" align="right"><label for="proname">รวมราคา</label></td>
        <td><label for="amount"></label>
          <input type="text" name="sum" id="textfield3" /></td>
      </tr>
    </table></td>
  </tr>
</table>

$("#tblamount").siblings().insertBefore($("#tramount").clone());

$(document).ready(function () {
    var counter = 0;
    counter = $('#myTable tr').length - 2;
 
    $("#addrow").on("click", function () {
         
 
        var newRow = $("<tr>");
        var cols = "";
 
        cols += '<td><input type="text" name="name' + counter + '"/></td>';
        cols += '<td><input type="text" name="price' + counter + '"/></td>';
 
        cols += '<td><input type="button" id="ibtnDel"  value="Delete"></td>';
        newRow.append(cols);
         
        $("table.order-list").append(newRow);
        counter++;
        if (counter == 5) $('#addrow').attr('disabled', true).prop('value', "You've reached the limit");
    });
 
    $("table.order-list").on("change", 'input[name^="price"]', function (event) {
        calculateRow($(this).closest("tr"));
        calculateGrandTotal();
    });
     
     
 
    $("table.order-list").on("click", "#ibtnDel", function (event) {
        $(this).closest("tr").remove();
        calculateGrandTotal();
        counter --;
        if (counter < 5) $('#addrow').attr("disabled", false).prop('value', "Add Row");
    });
 
 
});
 
 
 
function calculateRow(row) {
    var price = +row.find('input[name^="price"]').val();
 
}
 
function calculateGrandTotal() {
    var grandTotal = 0;
    $("table.order-list").find('input[name^="price"]').each(function () {
        grandTotal += +$(this).val();
    });
    $("#grandtotal").text(grandTotal.toFixed(2));
}

For i As Integer = 0 To 10 'ตามที่ต้องการ
   myTable.Columns.Add(xxx)
   myTable.Rows.Add(xxx)
Next