ASP ช่วยดูโค้ดให้หน่อยครับว่าทำไมถึงไม่สามารถ Update ข้อมูลได้ครับ

<form action="Tire_SaveUpdateTire.asp?CusID=<%=Request.QueryString("TireNumber")%>" name="frmEdit" method="post">
<%
	Dim Conn,strSQL,objRec,strSQL1,objRec1,Conn1
	Set Conn = Server.Createobject("ADODB.Connection")
	Conn.Open "Driver={SQL Server};Server=L0820_WUTTISAA1;Database=OVCM;UID=ovcm;PWD=Ninekao9;" 
	strSQL = "SELECT * FROM  FTire "
	strSQL = strSQL & "WHERE TireNumber LIKE '%"&Request.QueryString("CusID")&"%' "

	Set objRec = Conn.Execute(strSQL)
	If objRec.EOF Then
		Response.write("Not found CustomerID="&Request.QueryString("CusID"))
	Else
%>
<table width="830" align="center">
  <tr>
    <td align="center"><h2>Installation of tires to the vehicle</h2></td>
  </tr>
</table>
<table width="830" align="center">
  <tr>
    <td width="132" rowspan="4"  align="right"><img src="images/images (9).jpg" width="90" height="90" /></td>
    <td >&nbsp;&nbsp;&nbsp;Installation Date:&nbsp;</td>
    <td colspan="2" ><input type="date" name="bday" /></td>
    <td colspan="2">&nbsp;</td>
    </tr>
  <tr>
    <td >&nbsp;&nbsp;&nbsp;&nbsp;Tire No. :&nbsp;&nbsp;&nbsp;&nbsp;</td>
    <td colspan="2" ><input name="txtTireNo" type="text" disabled="disabled" value="<%=objRec.Fields("TireNumber")%>" size="10" />
    <input name="txtTireNo" type="hidden" value="<%=objRec.Fields("TireNumber")%>" /></td>
    <td colspan="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;JayaMix No. :&nbsp;&nbsp;&nbsp;&nbsp;
      <input name="txtJayaMixNo" type="text" disabled="disabled" value="<%=objRec.Fields("JayaMixNumber")%>" size="10" />
      <input name="txtJayaMixNo" type="hidden" value="<%=objRec.Fields("JayaMixNumber")%>" />
      </td>
    </tr>
  <tr>
    <td>&nbsp;&nbsp;&nbsp;&nbsp;Plate Number :&nbsp;&nbsp;&nbsp;</td>
    <td colspan="2"><select name="txtTruckPlate">
      <option value=""><-- Please Select Truck Plate --></option>
      <% 
			strSQL = "SELECT * FROM FTruckProfile order by Plant,PlateNumber"
			Set objRec = Server.CreateObject("ADODB.Recordset")
			objRec.Open strSQL, Conn, 1,3
			While Not objRec.EOF
			%>
      <option value="<%=objRec.Fields("PlateNumber").Value%>"><%=objRec.Fields("PlateNumber").Value & " - " & objRec.Fields("Plant").Value%></option>
      <%objRec.MoveNext
			Wend
			%>
    </select></td>
    <td colspan="2">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Position of Tire :&nbsp;&nbsp;&nbsp;&nbsp;
  <select name="txtPosition" >
    <option value="">&lt;-- Please Select Position --&gt;</option>
    <option value="R01">R01</option>
    <option value="L02">L02</option>
    <option value="R03">R03</option>
    <option value="L04">L04</option>
    <option value="R05">R05</option>
    <option value="L06">L06</option>
    <option value="R07">R07</option>
    <option value="L08">L08</option>
    <option value="R09">R09</option>
    <option value="L10">L10</option>
  </select> </td>
    </tr>
  <tr>
    <td width="105" align="center">&nbsp;</td>
    <td width="191">&nbsp;</td>
    <td width="48" align="center" >&nbsp;</td>
    <td width="144">&nbsp;</td>
    <td width="182">&nbsp;</td>
  </tr>
</table>
<table width="830" border="0" align="center">
  <tr>
    <th scope="col" align="center"><input type="image" src="images/submit.gif" value="submit"></th>
  </tr>
</table>

  <%
	End IF
	objRec.Close()
	Conn.Close()
	Set objRec = Nothing
	Set Conn = Nothing
  %>
</form>

<%
Dim Conn,strSQL,objExec
	Docdate = request.form("bday")
	TireNo = Request.Form("txtTireNo")
	JayaMixNo = Request.Form("txtJayaMixNo")
	TruckPlate = Request.Form("txtTruckPlate")
	Position = Request.Form("txtPosition")
	Set Conn = Server.Createobject("ADODB.Connection")
	Conn.Open "Driver={SQL Server};Server=L0820_WUTTISAA1;Database=OVCM;UID=ovcm;PWD=Ninekao9;" 
strSQL = "UPDATE FTire SET "
strSQL = strSQL &"InstallDate= '"&Docdate&"',PlateNumber='"&TruckPlate&"',"
strSQL = strSQL &"PositionTire='"&Position&"' "
strSQL = strSQL &"where TireNumber= '"&TireNo&"'  "
Set objExec = Conn.Execute(strSQL)
If Err.Number = 0 Then
%>
<meta http-equiv="refresh" content="3;URL=Truck_SearchInstallationTire.asp">
<div align="center"></div>
<table width="75%" border="0" align="center">
  <tr > 
    <td><div align="center">
      <p>Save Comple    </p>
    </div></td>
  </tr>
</table>
<div align="center"></div>
<table width="488" border="0" align="center">
  <tr >
    <td width="41%"><div align="center">Please wait or click</div></td>
    <td width="16%"><div align="center"><a href="Truck_SearchInstallationTire.asp"><img src="images/button_blue_repeat.png" width="70" height="70" /></a></div></td> 
    <td width="43%"> 
      <div align="center">For add New Tire</div>
    </td>
  </tr>
</table></th>
      </tr>
  </table>
<%
'Response.write("Save Done.")
Else
Response.write("Error Save ["&strSQL&"] ("&Err.Description&")")
End If
Conn.Close()
Set objExec = Nothing
Set Conn = Nothing
%>