WebRequest Equivalent to CURL command

Try this:

public static HttpWebResponse POST(string postData, string url, string referer, CookieContainer cookie)
{
try
{
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
request.Method = "POST";
request.KeepAlive = true;
request.AllowAutoRedirect = false;
request.Accept = "*/*";
request.ContentType = "application/x-www-form-urlencoded";
request.CookieContainer = cookie;
if (!string.IsNullOrEmpty(referer))
request.Referer = referer;
request.ContentLength = byteArray.Length;
request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.5) Gecko/2008120122 Firefox/3.0.5";
// request.Proxy = null;
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
return (HttpWebResponse)request.GetResponse();
}
catch
{
return (HttpWebResponse)null;
}
}

Some webapp checks whats the link before post to ensure max security