'This is a ASP.Net using VB.Net as CodeBehind 
Imports System
Imports System.IO
Imports System.Net
Imports System.Text

Partial Class _Default
    Inherits System.Web.UI.Page


    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim sURL As String
        Dim objReader As StreamReader

         'give the USERNAME,PASSWORD,moblienumbers.... on URL
        sURL = "http://www.smscountry.com/SMSCwebservice.asp?User=USERNAME&passwd=PASSWORD&mobilenumber=9199XXXXXX,91XXXXXX,...&message=TYPE YOUR SMS&sid=SENDERID&mtype=SMSTYPE&DR=Y OR N DELIVERY REPORTS"
        Dim wrGETURL As WebRequest
        wrGETURL = WebRequest.Create(sURL)
        ' SETUP PROXY
        Dim myProxy As New WebProxy("YOUR PROXY", PROXPORT)
        'myProxy.BypassProxyOnLocal = True
        wrGETURL.Proxy = myProxy

        Try
            Dim objStream As Stream
            objStream = wrGETURL.GetResponse.GetResponseStream()
            objReader = New StreamReader(objStream)
            Response.Write(objReader.ReadToEnd())
            objReader.Close()
        Catch ex As Exception
             ex.Message
       
        End Try
    End Sub
End Class