How to load data from a remote database using php file in vb.net?

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VB

PHP

I tried this code in vb.net but still no luck. I have a php file in my online database in my hosting site. I need to get specific data in my database like the aisle names only. how to load it in vb.net? Thankyou in advance.

Dim postData As String = "task=select"
Dim tempCookies As New CookieContainer
Dim encoding As New UTF8Encoding
Dim byteData As Byte() = encoding.GetBytes(postData)

Dim postReq As HttpWebRequest = DirectCast(WebRequest.Create("http://www.sample.com"), HttpWebRequest)
postReq.Method = "POST"
postReq.KeepAlive = True
postReq.CookieContainer = tempCookies
postReq.ContentType = "application/x-www-form-urlencoded"
postReq.Referer = "http://www.sample.com"
postReq.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; ru; rv:1.9.2.3) Gecko/20100401 Firefox/4.0 (.NET CLR 3.5.30729)"
postReq.ContentLength = byteData.Length

Dim postreqstream As Stream = postReq.GetRequestStream()
postreqstream.Write(byteData, 0, byteData.Length)
postreqstream.Close()
Dim postresponse As HttpWebResponse

postresponse = DirectCast(postReq.GetResponse(), HttpWebResponse)
tempCookies.Add(postresponse.Cookies)
logincookie = tempCookies
Dim postreqreader As New StreamReader(postresponse.GetResponseStream())

Dim thepage As String = postreqreader.ReadToEnd

RichTextBox1.Text = thepage

'PHP File

<?php
    include("config.php");
    include("sql.php");

    $sql = new sql;

    $task = $_POST['task'];



if ($task =="select")
    {
        $sql->execute_query("SELECT * FROM tbl_aisles");
    }


?>