using (WebClient client = new WebClient())
     {
         html = client.DownloadString(strUrl);
     }

using (WebClient client = new WebClient())
     {
        byte[] DataBuffer = client.DownloadData(strUrl);
        html = Encoding.ASCII.GetString(DataBuffer);
     }

WebResponse objResponse;
WebRequest objRequest = System.Net.HttpWebRequest.Create(strUrl);
objResponse = objRequest.GetResponse();
using (StreamReader sr = new StreamReader(objResponse.GetResponseStream()))
{
   html = sr.ReadToEnd();
   sr.Close();
}

<td align="right" style="color:Red;background-color:White;width:4.375em;border-bottom:1px solid black;border-right:1px solid black;">-27.0%</td>

<td align="right" bgcolor="White" style="border-bottom:1px solid black;border-right:1px solid black;"><font face="Arial,sans-serif" color="Red">-27.0%</font></td>

GET / HTTP/1.1
Connection: keep-alive
Accept: */*
User-Agent: Mozilla/5.0 (Windows NT 6.0) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: .ASPXBrowserOverride=Mozilla%2f4.0+(compatible%3b+MSIE+6.0%3b+Windows+CE%3b+IEMobile+8.12%3b+MSIEMobile+6.0);

Connection: keep-alive
Cache-Control: max-age=0
User-Agent: Mozilla/5.0 (Windows NT 6.0) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: .ASPXBrowserOverride=Mozilla%2f4.0+(compatible%3b+MSIE+6.0%3b+Windows+CE%3b+IEMobile+8.12%3b+MSIEMobile+6.0);

{Content-Length: 267123
Cache-Control: private
Content-Type: text/html; charset=utf-8
Date: Tue, 27 Nov 2012 18:37:27 GMT
Set-Cookie: ASP.NET_SessionId=******; path=/; HttpOnly
Server: Microsoft-IIS/7.5
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
}

using (WebClient client = new WebClient())
     {
         client.Headers.Add("user-agent", "Mozilla/5.0 (Windows NT 6.0) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11");
         html = client.DownloadString(strUrl);
     }

webClient.Headers.Add("user-agent", "Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_2 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8H7 Safari/6533.18.5");
var iphoneHtml = webClient.DownloadString("http://www.yoursite.com");
webClient.Headers.Add("user-agent", "Mozilla/5.0 (Windows NT 6.0) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11");
var safariHtml = webClient.DownloadString("http://www.yoursite.com");