using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Net;
using System.Web;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
System.Net.ServicePointManager.Expect100Continue = false;
Uri address = new Uri(“http://twitter.com/statuses/update.json“);
// Create the web request
HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;
request.Method = “POST”;
request.ContentType = “application/x-www-form-urlencoded”;
request.Credentials = new NetworkCredential(“username”, “password”);
StringBuilder data = new StringBuilder();
data.Append(“status=from%20.net”);
// Create a byte array of the data we want to send
byte[] byteData = UTF8Encoding.UTF8.GetBytes(data.ToString());
// Set the content length in the request headers
request.ContentLength = byteData.Length;
using (Stream postStream = request.GetRequestStream())
{
postStream.Write(byteData, 0, byteData.Length);
}
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
// Get the response stream
StreamReader reader = new StreamReader(response.GetResponseStream());
// Console application output
Console.WriteLine(reader.ReadToEnd());
}
}
}
}
Code to post on twitter and kwippy using this simple C# program 
. Njoi.