I found error: the remote server returned an error: (404) not found while creating new customer using c#.net.

        try
        {
           Customers customers = new Customers();
            Customer newCustomer = new Customer();

            string urlBase = "https://cheddargetter.com/xml";
            string urlPath = string.Format("/customers/new/productCode/{0}", _ProductCode);
            string postParams = string.Format(
                "code={0}" +
                "&firstName={1}" +
                "&lastName={2}" +
                "&email={3}" +
                "&company={4}" +
                "&subscription[planCode]={5}" +
                "&subscription[ccFirstName]={6}" +
                "&subscription[ccLastName]={7}" +
                "&subscription[ccNumber]={8}" +
                "&subscription[ccExpiration]={9}" +
                "&subscription[ccCardCode]={10}" +
                "&subscription[ccZip]={11}",
                HttpUtility.UrlEncode(customer.Code),
                HttpUtility.UrlEncode(customer.FirstName),
                HttpUtility.UrlEncode(customer.LastName),
                HttpUtility.UrlEncode(customer.Email),
                HttpUtility.UrlEncode(customer.Company),
                HttpUtility.UrlEncode(customer.PlanCode.ToString().ToUpper()),
                HttpUtility.UrlEncode(customer.CCFirstName),
                HttpUtility.UrlEncode(customer.CCLastName),
                HttpUtility.UrlEncode(customer.CCNumber),
                HttpUtility.UrlEncode(customer.CCExpiration),
                HttpUtility.UrlEncode(customer.CCCardCode),
                HttpUtility.UrlEncode(customer.CCZip));

            string result = postRequest(urlBase, urlPath, postParams);
            XDocument newCustomerXML = XDocument.Parse(result);

            customers = getCustomerList(newCustomerXML);

            if (customers.CustomerList.Count > 0)
            {
                newCustomer = customers.CustomerList[0];
            }
        }
        catch (Exception ex)
        {
            throw ex;
        }

Please help me to solve it.