Unable to post to paypal using HttpWebRequest in asp.net

I am trying to post information to paypal in order for customers to pay for merchandise on a site that I am developing. I am passing the information over so the paypal site can grab the info. I am using the HttpWebRequest and what is happening is that it is not redirecting to the paypal site. Here is the code that I am using.

Protected Sub lbAddress_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles lbAddress.Click

        Dim objRequest As HttpWebRequest
        Dim strRequest As String
        Dim arrRequest As Byte()
        Dim objUTF8Encoding As UTF8Encoding
        Dim strmRequest As Stream

        objRequest = CType(WebRequest.Create("https://www.paypal.com/cgi-bin/webscr"), HttpWebRequest)
        objRequest.Method = "POST"
        objRequest.ContentType = "application/x-www-form-urlencoded"

        strRequest = "?" & Server.UrlEncode("cmd=_cart &upload=1 &business=login@youremail.com&item_name_1=Item1 &amount_1=10.00")
        objUTF8Encoding = New UTF8Encoding
        arrRequest = objUTF8Encoding.GetBytes(strRequest)
        objRequest.ContentLength = arrRequest.Length
        strmRequest = objRequest.GetRequestStream()
        strmRequest.Write(arrRequest, 0, arrRequest.Length)

    End Sub

I have been trying to get this to work for a couple hours now and am totally stumped.

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I'm not sure if it helps, but I found a detailed code sample here...

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