Buzzcity Text advert script c#

public string ShowTextAd(string bz_partnerid)
{
// code by nolovelust

if (bz_partnerid == null)
{
bz_partnerid = "0000"; //default partnerid

}
string alternate_link = "http://click.buzzcity.net/click.php?partnerid=YOURID";
string alternate_link_text = "Click here";
string bz_ads_domain = "ads.buzzcity.net";
string bz_click_domain = "click.buzzcity.net";

// extract IP info

string ip = string.Empty;
if (HttpContext.Current.Request.ServerVariables["HTTP_X_OPERAMINI_PHONE"] != null && HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null)
{
// Opera mini or proxy client

string ip_str = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
System.Text.RegularExpressions.Regex r = new System.Text.RegularExpressions.Regex(@"%(\d{1,3}(?:[.]\d{1,3}){3})%", System.Text.RegularExpressions.RegexOptions.IgnoreCase);
System.Text.RegularExpressions.Match m = r.Match(ip_str);
if (m.Success)
{
ip = m.Groups[1].ToString();
}
}
if (String.IsNullOrEmpty(ip))
{
ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
}

// extract UA info

string ua = string.Empty;
string[] keyname_ua_arr = new string[] { "HTTP_X_DEVICE_USER_AGENT", "HTTP_X_OPERAMINI_PHONE_UA", "HTTP_USER_AGENT" };
foreach (string keyname_ua in keyname_ua_arr)
{
if (HttpContext.Current.Request.ServerVariables[keyname_ua] != null)
{
ua = HttpContext.Current.Server.UrlEncode(HttpContext.Current.Request.ServerVariables[keyname_ua].ToString());
break;
}
}
if (String.IsNullOrEmpty(ua))
{
ua = "No browser found";
}

//request ad

string url = "http://" + bz_ads_domain + "/show.php?get=1&partnerid=" + bz_partnerid + "&a=" + ua + "&i=" + ip;
System.Text.StringBuilder bz_request_result = new System.Text.StringBuilder();
try
{
System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(url);
request.Method = "GET";
request.Accept = "*/*";
request.ContentType = "text/html";
request.Timeout = 2000;
using (System.Net.HttpWebResponse response = request.GetResponse() as System.Net.HttpWebResponse)
{
System.IO.StreamReader reader = new System.IO.StreamReader(response.GetResponseStream());
bz_request_result.Append(reader.ReadToEnd());
}
}
catch (Exception e)
{
//error

return e.ToString();
}

string[] advert = bz_request_result.ToString().Split('\n'); ;
if (advert != null)
{
string text = advert[0].ToString();
string cid = advert[1].ToString();
// display BuzzCity TextAd

return "" + text + "";

}
else
{
//no advert

return "" + alternate_link_text + "";

}


}