Call Web Request method for Authorization process using C#

 private string WebRequestAuthorization(string url)
        {
            string jsonResponse = string.Empty;
            try
            {
                var webRequest = System.Net.WebRequest.Create(url);
                if (webRequest != null)
                {
                    webRequest.Proxy = new WebProxy(this.WebProxyUrl, true);
                    webRequest.Proxy.Credentials = CredentialCache.DefaultCredentials;
                    webRequest.Method = "GET";
                    webRequest.Headers.Add("Authorization", "");
                    using (System.IO.Stream s = webRequest.GetResponse().GetResponseStream())
                    {
                        using (System.IO.StreamReader sr = new System.IO.StreamReader(s))
                        {
                            jsonResponse = sr.ReadToEnd();
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                Logger.Error("Error while getting json response using web request", ex);
                throw ex;
            }
            return jsonResponse;
        }