thanks i did
thats solution:
HtmlElementCollection a = webBrowser1.Document.GetElementsByTagName("a");
foreach (HtmlElement b in a)
{
if (b.GetAttribute("href").StartsWith("http://forum.ge/?showuser="))
{
string item = b.GetAttribute("href");
int indx = item.Length - 26;
string retString = item.Substring(26, indx);
listBox1.Items.Add(retString);
item = null;
retString = null;
}
}