XPath Using HtmlAgilityPack and WebClient

htmlDoc.Load(stream);

//To get the value of descendent of form ,I tried to get value of all h1 having class=page_title ,
//it'd retrun all the combinations of heading h1 having class page_title

HtmlNodeCollection inputNodes = htmlDoc.DocumentNode.SelectNodesByPattern(@"descendant::form;//h
[@class='page_title']");
foreach (HtmlNode node in inputNodes)
{
string strValue = node.InnerText;
Console.WriteLine(strValue);
Console.ReadLine();
}
}

/// <summary>
/// Returns HtmlNodeCollection based on given pattern based XPath.
/// Example: "//body;//form;//table[3];//input"
/// </summary>
/// <param name="node">HtmlAgilityPack.HtmlNode</param>
/// <param name="pattern">String</param>
/// <returns>HtmlNodeCollection</returns>
public static HtmlNodeCollection SelectNodesByPattern(this HtmlNode node, string pattern)
{
if (node == null)
return null;
if (!pattern.Contains(";"))
return null;

string[] expressions = pattern.Trim().Split(new char[] { ';' });

HtmlNode tempNode = node;
int incr = 0;

for (incr = 0; incr < expressions.Length - 1; incr++)
if (tempNode != null)
tempNode = tempNode.SelectSingleNode(expressions[incr]);

if (tempNode != null)
return tempNode.SelectNodes(expressions[incr]);

return null;
}

}

}

Output