Send data using Post method from asp.net to EPOS Device

Hello Experts,
My aim is to send data to the EPOS device from asp.net page when requested. I am having following code

string URLAuth = "http://xyz.com/FarmerUpload.aspx";
  string postString = string.Format("inputEmailHandle={0}&name={1}&inputPassword={2}", FarmerCode, FarmerData);

  const string contentType = "application/x-www-form-urlencoded";
  System.Net.ServicePointManager.Expect100Continue = false;

  CookieContainer cookies = new CookieContainer();
  HttpWebRequest webRequest = WebRequest.Create(URLAuth) as HttpWebRequest;
  webRequest.Method = "POST";
  webRequest.ContentType = contentType;
  webRequest.CookieContainer = cookies;
  webRequest.ContentLength = postString.Length;
  webRequest.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.1) Gecko/2008070208 Firefox/3.0.1";
 webRequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
  webRequest.Referer = "http://xyz.com/FarmerUpload.aspx";

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But I am unable to send data to the EPOS Device (This device is configured to receive the data in POST method only)
I am able to get the data sent from EPOS device using query string. Based on that I need to send the data.