VB.NET ใครรับเขียนโปรแกรม แบบนี้อ่ะครับ ขอโค้ดก็ได้ครับ ชวยหน่อยครับ

        Dim url As String = "http://localhost/myphp/showAllData.php"
        Dim uri As Uri = New Uri(url, UriKind.Absolute)

        Dim postData As StringBuilder = New StringBuilder()
        postData.AppendFormat("{0}={1}", "NULL", HttpUtility.UrlEncode(""))

        Dim client As WebClient
        client = New WebClient()
        client.Headers(HttpRequestHeader.ContentType) = "application/x-www-form-urlencoded"
        client.Headers(HttpRequestHeader.ContentLength) = postData.Length.ToString()

        AddHandler client.UploadStringCompleted, AddressOf client_UploadStringCompleted
        AddHandler client.UploadProgressChanged, AddressOf client_UploadProgressChanged

        client.UploadStringAsync(uri, "POST", postData.ToString())