how to use http api in vb .net application

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VB

application

SMS

HTTPS

desktop

Hi All,

I have a htpp api for sending sms through a bulk sms sending website.
But i dont know how to use the api in my vb .net application. I have some code which i found as sample from sms website.

Imports System.IO
Imports System.Net
 Dim client As WebClient = New WebClient
        ' Add a user agent header in case the requested URI contains a query.
        client.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)")
        client.QueryString.Add("user", "[username]")
        client.QueryString.Add("password", "[password]")
        client.QueryString.Add("api_id", "[api_id]")
        client.QueryString.Add("to", "1234567890")
        client.QueryString.Add("text", "This is an example message")
        Dim baseurl As String = "http://api.clickatell.com/http/sendmsg"
        Dim data As Stream = client.OpenRead(baseurl)
        Dim reader As StreamReader = New StreamReader(data)
        Dim s As String = reader.ReadToEnd()
        data.Close()
        reader.Close()
        MessageBox.Show(s)
        Return

But i am getting an error connot route the massage. Please help me in this and thanks in advance.