用C#實現HTTP請求比較容易實現。根據網上的程式修改而成，實現程式碼如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.IO;


namespace HTTP_Request_V1
{
    public partial class Http_Post : Form
    {
        public Http_Post()
        {
            InitializeComponent();
        }

        private void btn_Go_Click(object sender, EventArgs e)
        {
            string postData = "username=" + txt_User.Text + "&password=" + txt_Pwd.Text;
            postData += ("&vcode=" + txt_VCode.Text);
            byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(postData);
            string url = txt_Url.Text;             
            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(new Uri(url));
            webRequest.Method = "POST";             //POST
            webRequest.ContentType = "application/x-www-form-urlencoded";
            webRequest.ContentLength = byteArray.Length;
            Stream newStream = webRequest.GetRequestStream();
            newStream.Write(byteArray, 0, byteArray.Length);
            newStream.Close();

            HttpWebResponse response = (HttpWebResponse)webRequest.GetResponse();
            StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
            txt_Response.Text = sr.ReadToEnd();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            txt_Url.Text = "http://fsmd.vicp.net:22279/PHP_001/hello2/index5.php";
            txt_User.Text = "Boy";
            txt_Pwd.Text = "12345";
            txt_VCode.Text = "admin";
        }
    }
}
 

為了測試，自己搭了一個簡單的WEB伺服器，使用PHP程式設計。程式碼如下：

index5.php

<?php
header("content-Type: text/html; charset=Utf-8");
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2015/12/5
 * Time: 21:37
 */
@$user = $_POST['username'];
@$pass =$_POST['password'];
@$vcode=$_POST['vcode'];
echo "使用者名稱=$user";
echo 
 
"|密碼=$pass";
echo "|驗證碼=$vcode";
?>

程式執行結果如下：