Create HTTP request and receive response using asp.net C#

 Create HTTP request and receive response using asp.net C#   
       1.Simple http request  
        Uri objurl = new Uri(url);  
       WebRequest objWebRequest = WebRequest.Create(objurl);  
       WebResponse objWebResponse = objWebRequest.GetResponse();  
       Stream objstream = objWebResponse.GetResponseStream();  
       StreamReader objStreamReader = new StreamReader(objstream);  
       string strHtml = objStreamReader.ReadToEnd();  
        2.HTTP Post request and response  
       HttpWebRequest req = (HttpWebRequest)WebRequest.Create("https://clinet-url.com/sub/Activate");        
       req.Method = "POST";  
       req.ContentType = "application/x-www-form-urlencoded";  
       req.Credentials = CredentialCache.DefaultNetworkCredentials;  
       req.ClientCertificates.Add(clint_certificate);  
       strNewReqValue = strFormValues + "&mssdn=" + msisdn + "&srv=" + Service + "&user=username";  
       req.ContentLength = strNewReqValue.Length;  
       StreamWriter stOut = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII);  
       stOut.Write(strNewReqValue);  
       stOut.Close();  
       StreamReader stIn = new StreamReader(req.GetResponse().GetResponseStream());  
       Res = stIn.ReadToEnd();  
       Response = Res.ToString();  
       stIn.Close();