Getting XPATH from table in webpage

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Visual-Studio

HTML

table

XPath

Hi, I have the following xpath: /html/body/div/div/div/div[2]/div/div/div/div[3]/div/table/tbody/tr/td[2]/a

from:

<table class="search-result" width="100%">
<tbody>
<tr>
<td class="result-num">
<td class="result-header" colspan="2">
<a class="srtitle" href="http://books.ioba.org/books/129444230.html">Reader's Digest Condensed Books, Volume 3, 1970</a>

and I need to get the inner html of that xpath, however my application is giving me a null exception (i guess it is finding that the path is wrong or something)

here is my current code:

HtmlAgilityPack.HtmlNode rootNode = htmlDoc.DocumentNode;
titleBook = rootNode.SelectSingleNode(@".//table/tbody/tr/td[2]/a").InnerHtml.ToString();


I tried using @"//table[contains(@class, 'result-header')]/a" instead but still did not work.
what am I doing wrong?

thanks!