c# downloading webpage. improved proceed needed, cpu use high

i'm perplexing square formula operative small better. i think it's loop reading byte during time. i couldn't another proceed doing gzip decompression. implementing streamreader fine, nonetheless advantage twine i can't pass decompression stream.

is there improved way?

byte[] bufffer = null;
list<byte> resourcebytes = new list<byte>();
int bytevalue = 0;
webresource apparatus = new webresource();
httpwebresponse webresponse = null;

try {
    httpwebrequest webrequest = (httpwebrequest)webrequest.create(resourceuri);
    webrequest.headers.add(httprequestheader.acceptencoding, "gzip,deflate");
    webrequest.headers.add(httprequestheader.acceptcharset, "iso-8859-1,utf-8;q=0.7,*;q=0.7");
    webrequest.useragent = agent;
    webrequest.accept = "text/html, application/xml;q=0.9, application/xhtml+xml, image/png, image/jpeg, image/gif, image/x-xbitmap, */*;q=0.1";
    webrequest.credentials = credentialcache.defaultcredentials;
    webrequest.referer = resourceuri.originalstring;
    webrequest.timeout = 5000;

    webresponse = (httpwebresponse)webrequest.getresponse();

    tide webstream = webresponse.getresponsestream();

    (!string.isnullorempty(webresponse.contentencoding)) {
        (webresponse.contentencoding.tolower().contains("gzip")) {
            webstream = new gzipstream(webstream, compressionmode.decompress);
        }
        else (webresponse.contentencoding.tolower().contains("deflate")) {
            webstream = new deflatestream(webstream, compressionmode.decompress);
        }
    }

    {
        bytevalue = webstream.readbyte();

        (bytevalue != -1) {
            resourcebytes.add((byte)bytevalue);
        }

    } while (bytevalue != -1);


    //free adult resources
    webstream.close();
    webresponse.close();

    bufffer = resourcebytes.toarray();