How to calculate HttpWebRequest spent outbound and inbound internet traffic

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C#

WPF

C#5.0

I have the below function to fetch a page. My question is i want to calculate how much internet connection is spent

Both inbound (download) and outbound traffic (sent)

How can i do that ? Thank you

My function

C# .net 4.5 WPF application

public static string func_fetch_Page(string srUrl, int irTimeOut = 60,
    string srRequestUserAgent = "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0",
    string srProxy = null)
    {
        string srBody = "";
        string srResult = "";
        try
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(srUrl);

            request.Timeout = irTimeOut * 1000;
            request.UserAgent = srRequestUserAgent;
            request.KeepAlive = true;
            request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";

            WebHeaderCollection myWebHeaderCollection = request.Headers;
            myWebHeaderCollection.Add("Accept-Language", "en-gb,en;q=0.5");
            myWebHeaderCollection.Add("Accept-Encoding", "gzip, deflate");

            request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;

            using (WebResponse response = request.GetResponse())
            {
                using (Stream strumien = response.GetResponseStream())
                {
                    using (StreamReader sr = new StreamReader(strumien))
                    {
                        srBody = sr.ReadToEnd();
                        srResult = "success";
                    }
                }
            }
        }
        catch ()
        {

        }

        return srBody;
    }