class Program
    {
        static void Main(string[] args)
        {

            string viewstateid = "/wEPDwUKLTY3NjEyMzE4NWRkK4DxZpjTmZg/RGCS2s13vkEWmwWiEE6v+XrYoWVuxeg=";
            string eventid ="/wEdAAoSjOGPZYAAeKGjkZOhQ+aKHfOfr91+YI2XVhP1c/pGR96FYSfo5JULYVvfQ61/Uw4pNGL67qcLo0vAZTfi8zd7jfuWZzOhk6V/gFA/hhJU2fx7PQKw+iST15SoB1LqJ4UpaL7786dp6laCBt9ubQNrfzeO+rrTK8MaO2KNxeFaDhrQ0hxxv9lBZnM1SHtoODXsNUYlOeO/kawcn9fX0BpWN7Brh7U3BIQTZwMNkOzIy+rv+Sj8XkEEA9HaBwlaEjg=";

            string username = "user1";
            string password = "ttee";

            string loginbutton = "Log In";

            string URLAuth = "http://localhost/login.aspx";
            string postString = string.Format("VIEWSTATE={0}&EVENTVALIDATION={1}&LoginUser_UserName={2}&LoginUser_Password={3}&LoginUser_LoginButton={4}",viewstateid,eventid, username, password,realm,otp,loginbutton);

            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://localhost/login.aspx";

            StreamWriter requestWriter = new StreamWriter(webRequest.GetRequestStream());
            requestWriter.Write(postString);
            requestWriter.Close();

            StreamReader responseReader = new StreamReader(webRequest.GetResponse().GetResponseStream());
            string responseData = responseReader.ReadToEnd();
            Console.WriteLine(responseData);
            responseReader.Close();
            webRequest.GetResponse().Close();

        }
    }

curl --data "post1=value1&post2=value2&etc=valetc" http://host/resource

curl -X POST -d @file http://host/resource

http://localhost/library/book/34

POST library/book/34 HTTP/1.0rn
X-Requested-With: XMLHttpRequestrn
Content-Type: text/htmlrn
Referer: localhostrn
Content-length: 36rnrn
title=Learning+REST&author=Some+Name

DATA="foo=bar&baz=qux"
curl --data "$DATA" --request POST --header "Content-Type:application/x-www-form-urlencoded" http://example.com/api/callback | python -m json.tool

exec 3<> /dev/tcp/example.com/80

DATA='{"email": "foo@example.com"}'
LEN=$(printf "$DATA" | wc -c)

cat >&3 << EOF
POST /api/retrieveInfo HTTP/1.1
Host: example.com
User-Agent: Bash
Accept: */*
Content-Type:application/json
Content-Length: $LEN
Connection: close

$DATA
EOF

# Read response.
while read line <&3; do
   echo $line
done

curl -X POST -A 'Mozilla/5.0 (X11; Linux x86_64; rv:30.0) Gecko/20100101 Firefox/30.0' -d "field=acaca&name=afadxx" https://example.com