using System;

using System.IO;

using System.Net;

using System.Text;

​

public class Program

{

    public static void Main(string[] args)

    {

        byte[] data = Encoding.ASCII.GetBytes(

            "firstName=Foo&lastName=Bar");

​

        WebRequest request = WebRequest.Create("http://jsonplaceholder.typicode.com/posts");

        request.Method = "POST";

        request.ContentType = "application/x-www-form-urlencoded";

        request.ContentLength = data.Length;

        using (Stream stream = request.GetRequestStream())

        {

            stream.Write(data, 0, data.Length);

        }

​

        string responseContent = null;

​

        using (WebResponse response = request.GetResponse())

        {

            using (Stream stream = response.GetResponseStream())

            {

                using (StreamReader sr99 = new StreamReader(stream))

                {

                    responseContent = sr99.ReadToEnd();

                }

            }

        }

​

        Console.WriteLine(responseContent);

    }

}