Post JSON data with Authorization header using asp.net and c#

Task: Post JSON data with Authorization header using asp.net and c#.

Description: Post JSON data with Authorization header using asp.net and c#. There is two methods for posting form, Get and Post. Here I used Post method with Basic Authorization header for submitting the form. 

using System.Net;

using System.IO;

using System.Web.Script.Serialization;

public class ProductResponse

{

    public string submitstatus { get; set; }

    public string reference { get; set; }

}

public void ProductSubmit( )

{

    try

    {

        string baseurl = "https://hemantrautela.blogspot.com/productsubmit";

        string Authkey = "ba1f3a6e97ceed3358c9b8a54d2a8f56efexy78d";

        string postString = @"{'productid': '7',

                          'quantity': '1',

                          'total_amount': 700.00,

                          'curruncy': 'INR',

                          'clientIpAddress': '" + Request.UserHostAddress + @"',

                          'clientUserAgent': '" + Request.UserAgent + @"' }";

        HttpWebRequest webReq = WebRequest.Create(baseurl) as HttpWebRequest;

        webReq.Method = "POST";

        webReq.ContentType = "application/json; charset=utf-8";

        webReq.ContentLength = postString.Length;

        webReq.Accept = "application/json";

        webReq.Headers.Add("API-Version", "4.1.0");

        byte[] authBytes = Encoding.UTF8.GetBytes((Authkey).ToCharArray());

        webReq.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(authBytes));

        StreamWriter requestWriter = new StreamWriter(webReq.GetRequestStream());

        requestWriter.Write(postString);

        requestWriter.Close();

        StreamReader responseReader = new StreamReader(webReq.GetResponse().GetResponseStream());

        string responseData = responseReader.ReadToEnd();

        ProductResponse productresp = new JavaScriptSerializer().Deserialize<ProductResponse>(responseData);

        List<ProductResponse> resp_obj = new List<ProductResponse>();

        resp_obj.Add(productresp);

        string referencevalue = productresp.reference;

        string submitstatus = productresp.submitstatus;

        responseReader.Close();

        webReq.GetResponse().Close();

    }

    catch (Exception ex)

    {

    }

}