My program uses HtmlAgilityPack and grabs a HTML web page, stores it in a

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Asked: May 27, 20262026-05-27T15:20:53+00:00 2026-05-27T15:20:53+00:00

My program uses HtmlAgilityPack and grabs a HTML web page, stores it in a

0

My program uses HtmlAgilityPack and grabs a HTML web page, stores it in a variable and I’m trying to get from the HTML two tables which are under specific Div Class tags (boardcontainer). With my current code it searches through the whole web page for every table and displays them but when a cell is empty it throws an exception:

“NullReferenceException was unhandled – Object reference not set to an instance of an object.”.

A snippet of the HTML (In this case I’m searching ‘Microsoft’ on the website:

<div class="boardcontainer">
<table cellpadding="4" cellspacing="1" border="0" width="100%">
<tr><td colspan="6" class="catbg" height="18" >Main Database</td></tr>
<tr>
    <td class="windowbg" width="28%" align="center">Company Name</td>
    <td class="windowbg" width="12%" align="center">0870 / 0871</td>
    <td class="windowbg" width="12%" align="center">0844 / 0845</td>
    <td class="windowbg" width="12%" align="center">01 / 02 / 03</td>
    <td class="windowbg" width="12%" align="center">Freephone</td>
    <td class="windowbg" width="24%" align="center">Other Information</td>
</tr>
    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.websitename.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC>�0870 601 0100</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC>�0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC>�01954 713950</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC>�</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC>�<b>Customer Support</b><br><i>Straight to agent (no menu)</i><br><font size=1>Also for 0870 6010200</font></td></tr>
    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.websitename.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC>�0870 601 0100</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC>�0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC>�0118 909 7800</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC>�</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC>�<b>Main UK Switchboard</b><br><i>Ask to be put through to required department</i><br><font size=1>Also for 0870 6010200</font></td></tr>
    <tr>

This is my current code which only grabs tables and displays the rows + cells then throws an exception upon Null.

        string html = myRequest.GetResponse();
        HtmlDocument htmlDoc = new HtmlDocument();
        htmlDoc.LoadHtml(html);


        foreach (HtmlNode table in htmlDoc.DocumentNode.SelectNodes("//table"))
        {
            Console.WriteLine("Found: " + table.Id);
            foreach (HtmlNode row in table.SelectNodes("tr"))
            {
                Console.WriteLine("row");
                foreach (HtmlNode cell in row.SelectNodes("th|td")) //Exception is thrown here
                {
                    Console.WriteLine("cell: " + cell.InnerText);
                }
            }
        }

How can I change this to search the specific div class and extract the table from within?

Thank you for reading.

FULL HTML:

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />

<form method="post" action="sdfsd.php">
<html>
<head><title>SAYNOTO0870.COM - Non-Geographical Alternative Telephone Numbers</title>
<meta name='copyright' content='SAYNOTO0870.COM - 1999-2010'>
<META name="y_key" content="5a00e35b9f1986b0" >
</head>

<body>
<BODY bgColor=#ffffe6>
<table border="0" width="100%" id="headertable1">
    <tr>

        <td width="335" valign="top">
<font face='Tahoma' size='2'>
        <center><b>
        <font size="6">SAY<font color="#FF0000">NO</font>TO<font color="#FF0000">0870</font>.COM</font>
</b></center>
</font>
<font face='Tahoma' size='4'>
<center><b><font size="2">Non-Geographical Alternative Telephone Numbers</font></b><font size="3"></font><font face='Tahoma' size='2'></font><br>

<span style="font-weight: 700"><font size="1">Awarded Website Of The Day by 
BBC Radio 2, and  featured<br>
on the BBC Radio 2's 
Jeremy Vine show and The Guardian.</font></span></center>
        </td>
        <td width="403" rowspan="2" align="center">

<a href="http://energy.saynoto0870.com" target="_blank"><img src="/banners/energyheader.gif" alt="Save Money on your Gas and Electricity" width="420" height="60" border="0" align="middle"></a>        
        </td>  </tr></table>
<table width="92%" cellspacing="1" cellpadding="0" border="0" align="CENTER">
  <tr> 
    <td align="center"> 
      <table bgcolor="#AFC6DB" width="100%" cellspacing="0" cellpadding="0" align="center">

        <tr> 
          <td width="100%" align="center"> 
            <table border="0" width="100%" cellpadding="3" cellspacing="0" bgcolor="#AFC6DB" align="center">
              <tr> 
                <td valign="middle" bgcolor="#CCFFCC" align="center" width="180">
<font face='Tahoma' size='2'>
                <b>
<a href="/">
                <img src="/images/home.gif" alt="Home" border="0">Home</a></td>
                <td valign="middle" bgcolor="#CCFFCC" align="center" width="143">
                <b>

<font face='Tahoma' size='2'>

                <a href="/cgi-bin/forum/YaBB.cgi">
                <img src="/images/forum.gif" alt="Discussion Forum" border="0">Discussion Forum</a></td>
                <td valign="middle" bgcolor="#CCFFCC" align="center" width="134">
                <font face="Tahoma" size="2">
                <b>
                <a href="/links.php">
                <img src="/images/links.gif" alt="Links" border="0">Links</a></td>

                <td valign="middle" bgcolor="#CCFFCC" align="center" width="103">
                <font face="Tahoma" size="2">
                <b>
                <a href="/help.php">
                <img src="/images/help.gif" alt="Help" border="0">Help</a></td>
                <td valign="middle" bgcolor="#CCFFCC" align="center" width="114">
                <font face="Tahoma" size="2">
                <b>

                <a href="/contact">
                <img src="/images/contact.gif" alt="Contact Us" border="0">Contact Us</a>
                </td>
              </tr>
              <tr> 
                <td valign="middle" bgcolor="#CCFFCC" align="center" width="321" colspan="2">
<font face='Tahoma' size='2'>
                <a href="/search.php">
                <font face="Tahoma">

                <b>
                <font size="2">
                <img src="/images/search.gif" alt="Search" border="0"></font></b></font><font size="2"><b>Search 
                to find an alternative number</b></font></a></td>
                <td valign="middle" bgcolor="#CCFFCC" align="center" width="365" colspan="3">
<font face='Tahoma' size='2'>
                <a href="/add.php">
                <font face="Tahoma">
                <b>
                <font size="2">

                <img src="/images/addno.gif" alt="Add A New Number" border="0"></font></b></font><font size="2"><b>Click 
                here to add a new alternative number</b></font></a></td>
              </tr>
            </table>
          </td>
        </tr>
      </table>
    </td>
  </tr>

</table>

<br>
<center>
<script type="text/javascript"><!--
google_ad_client = "pub-9959843696187618";
google_ad_width = 468;
google_ad_height = 60;
google_ad_format = "468x60_as";
google_ad_type = "text_image";
//2007-06-07: SAYNOTO0870-Header
google_ad_channel = "6422558175";
google_color_border = "ffffe6";
google_color_bg = "ffffe6";
google_color_link = "32527A";
google_color_text = "000000";
google_color_url = "2D8930";
//-->
</script>
<script type="text/javascript"
  src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
</center>
<BR><input type=hidden name="search_name" value="Microsoft">
</form>
<link rel="stylesheet" href="search.css" type="text/css" />

  <table width="100%" align="center" border="0">
  <tr>

    <td><font size="2">

<div class="seperator"></div>

<div class="boardcontainer">
<table cellpadding="4" cellspacing="1" border="0" width="100%">
<tr><td colspan="6" class="catbg" height="18" >Main Database</td></tr>

<tr>
    <td class="windowbg" width="28%" align="center">Company Name</td>
    <td class="windowbg" width="12%" align="center">0870 / 0871</td>

    <td class="windowbg" width="12%" align="center">0844 / 0845</td>
    <td class="windowbg" width="12%" align="center">01 / 02 / 03</td>
    <td class="windowbg" width="12%" align="center">Freephone</td>
    <td class="windowbg" width="24%" align="center">Other Information</td>
</tr>


    <tr>

<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 601 0100</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 01954 713950</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Customer Support</b><br><i>Straight to agent (no menu)</i><br><font size=1>Also for 0870 6010200</font></td></tr>
    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 601 0100</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0118 909 7800</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Main UK Switchboard</b><br><i>Ask to be put through to required department</i><br><font size=1>Also for 0870 6010200</font></td></tr>

    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 601 0100</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> +35314502113</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Customer Support</b><br><i>Answers as Microsoft Ireland with same options as UK 08 numbers</i><br>Reduce cost using 1899 (or similar)<br><font size=1>Also for 0870 6010200</font></td></tr>
    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 241 1963</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 020 3147 4930</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0800 0188354</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Product Activation</b><br><i>Home & Business (Volume Licensing)</i><br><font size=1>Also: 0800 018 8364 & +800 2284 8283<br>Also for 0870 6010100 & 0870 6010200</font></td></tr>

    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 241 1963</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0800 9179016</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Volume Licensing</b></td></tr>
    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 020 3027 6039</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0800 7318457</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Online Services Support</b><br><i>MSN, Hotmail, Live, Messenger etc</i><br><font size=1>Also: 0800 587 2920</font></td></tr>

    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 607 0700</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 6006</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> +35317065353</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Ask Partner Hotline</b><br><i>Answers with same options</i><br>Reduce cost using 1899 (or similar)</td></tr>
    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 607 0700</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 6006</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0800 9173128</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Partner Network Regional Service Centre</b><br><i>Help with membership questions and tools, benefits and resource queries</i></td></tr>

    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 601 0100</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0800 0324479</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Direct Services</b><br><font size=1>Also for 0870 6010200</font></td></tr>
    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk/msdn target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 601 0100</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> +35318831002</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0800 0517215</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>MSDN (Microsoft Developers Network)</b><br>When calling +353 reduce cost using 1899 (or similar)<br><font size=1>Also for 0870 6010200</font></td></tr>

    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.microsoft.co.uk/technet target="_blank">Microsoft</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0870 601 0100</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0844 800 2400</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> +35318831002</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0800 281221</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Microsoft Technet</b><br>When calling +353 reduce cost using 1899 (or similar)<br><font size=1>Also for 0870 6010200</font></td></tr>
    <tr>
<td class=windowbg2 width=28% align=center BGCOLOR=#FFFFCC><a href=http://www.saynoto0870.com/exit.php?site=www.xbox.co.uk target="_blank">Microsoft XBOX</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> </a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 020 7365 9792</a></td><td class=windowbg2 width=12% align=center BGCOLOR=#FFFFCC> 0800 5871102</a></td><td class=windowbg2 width=24% align=center BGCOLOR=#FFFFCC> <b>Customer Support</b></td></tr>

    <tr>

</tr>
</table>
</div><br />    

<table width="100%" align="center" border="0">
  <tr><td><font size="2">
<div class="seperator"></div>

<div class="boardcontainer">
<table cellpadding="4" cellspacing="1" border="0" width="100%">

<tr><td colspan="6" class="catbg" height="18" >Unverified Numbers Database</td></tr>

<tr>
    <td class="windowbg" width="28%" align="center">Company Name</td>
    <td class="windowbg" width="12%" align="center">0870 / 0871</td>
    <td class="windowbg" width="12%" align="center">0844 / 0845</td>
    <td class="windowbg" width="12%" align="center">01 / 02 / 03</td>
    <td class="windowbg" width="12%" align="center">Freephone</td>
    <td class="windowbg" width="24%" align="center">Other Information</td>

</tr>

<td class=windowuv width=28% align=center BGCOLOR=#CCFFFF> Microsoft</td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> 0870 501 0800</a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> 0844 800 8338</a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> 0118 909 7994</a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> </a></td><td class=windowuv width=24% align=center BGCOLOR=#CCFFFF> <b>Premier Support</b></td></tr>
    <tr>
<td class=windowuv width=28% align=center BGCOLOR=#CCFFFF>Microsoft AskPartner (Licensing)</a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> 0870 607 0700</a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> </a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> 020 8784 1000</a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> </a></td><td class=windowuv width=24% align=center BGCOLOR=#CCFFFF> Switchboard of Sitel UK in Kingston where the AskPartner team is based. Ask for Microsoft Team. 0800 - 1800.</td></tr>

    <tr>
<td class=windowuv width=28% align=center BGCOLOR=#CCFFFF> Microsoft Office Live Meeting</td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> </a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> </a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> 020 3024 9260</a></td><td class=windowuv width=12% align=center BGCOLOR=#CCFFFF> 0800 0854811</a></td><td class=windowuv width=24% align=center BGCOLOR=#CCFFFF> EMC Conferencing on Meeting Place</td></tr>

</tr>
</table>
</div><br />

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<table cellpadding="4" cellspacing="1" border="0" width="100%">
<tr>
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    </td>
</tr>

    <td class="windowbg2">
        <div style="float: left; width: 59%; text-align: left;">

        <span class="small">Please use the Contact Us option, to report any incorrect numbers that you notice on the site.  Thanks for your support.</span><br />
        </div>
        <div style="float: left; width: 40%; text-align: left;">
        <div class="small" style="float: left; width: 49%;"><span style="color: red;"><b>lllll</b></span> Main Database - A number that has been checked and at the time it was checked worked correctly.  Please let us know of any numbers that no longer work as expected.</div><div class="small" style="float: left; width: 49%;"><span style="color: #CCFFFF;"><b>lllll</b></span> Unverified Number - A number that has been added by a visitor to the website, and hasn't yet been verified as correct.  Please use the Contact Us link at the top of the page to let us know if these work (or don't work) for you.</div>
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</table>


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1 Answer

Editorial Team · Answer 1 · 2026-05-27T15:20:53+00:00

The following XPATH allows you to search for a specific DIV (with the class ‘boardcontainer’) within your HTML document:

//div[@class='boardcontainer']/table

To handle empty rows, simply check whether or not the returned HtmlNodeCollection is null.

Here is a complete example:

HtmlDocument htmlDoc = new HtmlDocument();
htmlDoc.LoadHtml(html);

foreach (HtmlNode table in htmlDoc.DocumentNode.SelectNodes("//div[@class='boardcontainer']/table"))
{
  Console.WriteLine("Found: " + table.Id);

  foreach (HtmlNode row in table.SelectNodes("tr"))
  {
    Console.WriteLine("row");

    HtmlNodeCollection cells = row.SelectNodes("th|td");

    if (cells == null)
    {
      continue;
    }

    foreach (HtmlNode cell in cells)
    {                        
      Console.WriteLine("cell: " + cell.InnerText);
    }
  }
}

You should also check if a table is found and if the found table contains rows at all.

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