I am Scraping HTML DOM elements using HtmlAgilityPack in ASP.NET

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C#

ASP.NET

C#4.0

I am Scraping HTML DOM elements using HtmlAgilityPack in ASP.NET. currently my code is loading all the href links which means that sublinks of sublinks also . But I need only the depending URL of my domain URL. I don't know how to write code for it. Can any one help me to do this?
Here is my code:
public void GetURL(string strGetURL)
{
var getHtmlSource = new HtmlWeb();
var document = new HtmlDocument();
try
{
document = getHtmlSource.Load(strGetURL);
var aTags = document.DocumentNode.SelectNodes("//a");
if (aTags != null)
{
outputurl.Text = string.Empty;
int _count = 0;
foreach (var aTag in aTags)
{
string strURLTmp;
strURLTmp = aTag.Attributes["href"].Value;
if (_count != 0)
{
if (!CheckDuplicate(strURLTmp))
{
lstResults.Add(strURLTmp);
outputurl.Text += strURLTmp + "\n";
counter++;
GetURL(strURLTmp);
}
}
_count++;
}
}
}