ช่วยหน่อยค่ะ Error Query SELECT*FROM webboard WHERE QuestionID=''

<a href="NewQuestion.php">New Topic</a>
<?
$objConnect = mysql_connect("localhost","root","1234") or die("Error Connect to Database");
$objDB = mysql_select_db("cake");
$strSQL = "SELECT * FROM webboard";
$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
$Num_Rows = mysql_num_rows($objQuery);

$Per_Page = 10;   // Per Page

$Page = $_GET["Page"];
if(!$_GET["Page"])
{
	$Page=1;
}

$Prev_Page = $Page-1;
$Next_Page = $Page+1;

$Page_Start = (($Per_Page*$Page)-$Per_Page);
if($Num_Rows<=$Per_Page)
{
	$Num_Pages =1;
}
else if(($Num_Rows % $Per_Page)==0)
{
	$Num_Pages =($Num_Rows/$Per_Page) ;
}
else
{
	$Num_Pages =($Num_Rows/$Per_Page)+1;
	$Num_Pages = (int)$Num_Pages;
}

$strSQL .=" order  by QuestionID DESC LIMIT $Page_Start , $Per_Page";
$objQuery  = mysql_query($strSQL);
?>
<table width="909" border="1">
  <tr>
    <th width="80" align="center">QuestionID</th>
    <th width="458" align="center">Question</th>
    <th width="90" align="center"> Name</th>
    <th width="130" align="center">CreateDate</th>
    <th width="45" align="center">View</th>
    <th width="47" align="center">Reply</th>
  </tr>
<?
while($objResult = mysql_fetch_array($objQuery))
{
?>
  <tr>
    <td align="center"><?=$objResult["QuestionID"];?></td>
    <td align="center"><a href="ViewWebboard.php?QuestionID=<?=$objResult["QuestionID"];?>"><?=$objResult["Question"];?></a></td>
    <td align="center"><?=$objResult["Name"];?></td>
    <td align="center"><?=$objResult["CreateDate"];?></td>
    <td align="center"><?=$objResult["View"];?></td>
    <td align="center"><?=$objResult["Reply"];?></td>
  </tr>
<?
	  }
	  ?>
</table>
<br>
Total <?= $Num_Rows;?> Record : <?=$Num_Pages;?> Page :
<?
if($Prev_Page)
{
	echo " <a href='$_SERVER[SCRIPT_NAME]?Page=$Prev_Page'><< Back</a> ";
}
for($i=1; $i<=$Num_Pages; $i++){
     if($i != $Page)
     {
     echo "[ <a href='$_SERVER[SCRIPT_NAME]?Page=$i'>$i</a> ]";
     }
     else
     {
      echo "<b> $i </b>";
      }
}
if($Page!=$Num_Pages)
{
        echo " <a href ='$_SERVER[SCRIPT_NAME]?Page=$Next_Page'>Next>></a> ";
}
mysql_close($objConnect);
?>

<?
//*** Select Question ***//
$strSQL = "SELECT*FROM webboard  WHERE QuestionID='".$_GET["QuestionID"]."' ";
$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
$objResult = mysql_fetch_array($objQuery);

//*** Update View ***//
$strSQL = "UPDATE webboard";
$strSQL .="SET View = View + 1 WHERE QuestionID = '".$_GET["QuestionID"]."' ";
$objQuery = mysql_query($strSQL);	
?>
<table width="738" border="1" cellpadding="1" cellspacing="1">
  <tr>
    <td colspan="2"><center><h1><?=$objResult["Question"];?></h1></center></td>
  </tr>
  <tr>
    <td height="53" colspan="2"><?=nl2br($objResult["Details"]);?></td>
  </tr>
  <tr>
    <td width="397">Name : <?=$objResult["Name"];?> Create Date : <?=$objResult["CreateDate"];?></td>
    <td width="253">View : <?=$objResult["View"];?> Reply : <?=$objResult["Reply"];?></td>
  </tr>
</table>
<br>
<br>
<?
$intRows = 0;
$strSQL2 = "SELECT * FROM reply  WHERE QuestionID = '".$_GET["QuestionID"]."' ";
$objQuery2 = mysql_query($strSQL2) or die ("Error Query [".$strSQL."]");
while($objResult2 = mysql_fetch_array($objQuery2))
{
	$intRows++;
?> No : <?=$intRows;?>
<table width="738" border="1" cellpadding="1" cellspacing="1">
  <tr>
    <td height="53" colspan="2"><?=nl2br($objResult2["Details"]);?></td>
  </tr>
  <tr>
    <td width="397">Name :
        <?=$objResult2["Name"];?>      </td>
    <td width="253">Create Date :
    <?=$objResult2["CreateDate"];?></td>
  </tr>
</table><br>
<?
}
?>
<br>
<a href="Webboard.php">Back to Webboard</a> <br>
<br>
<form action="ViewWebboard.php?QuestionID=<?=$_GET["QuestionID"];?>&Action=Save" method="post" name="frmMain" id="frmMain">
  <table width="738" border="1" cellpadding="1" cellspacing="1">
    <tr>
      <td width="78">Details</td>
      <td><textarea name="txtDetails" cols="50" rows="5" id="txtDetails"></textarea></td>
    </tr>
    <tr>
      <td width="78">Name</td>
      <td width="647"><input name="txtName" type="text" id="txtName" value="" size="50"></td>
    </tr>
  </table>
  
  <input name="btnSave" type="submit" id="btnSave" value="Submit">
</form>