HttpWebRequest with FormsAuthentification web application

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ASP.NET

SSRS

Hi,

i'm using HttpWebRequest to do a call to my SSRS Server to get a PDF exportation of my report.

Here's the code i'm using.

Dim reportURL As String = "http://server/ReportServer/Pages/ReportViewer.aspx?%2fRAM%2fBooking&rs:Command=Render&rs:Format=PDF"
Dim request As WebRequest

reportURL += "&idbooking=" + Session("idbooking").ToString

'main booking
request = System.Net.HttpWebRequest.Create(reportURL + "&idref=0")

request.Credentials = System.Net.CredentialCache.DefaultNetworkCredentials


'Make a new attachment with the the stream from the response object
Attachment = New Attachment(request.GetResponse().GetResponseStream(), "Booking complet.pdf")

'Add this attachment to an email object
mail.Attachments.Add(Attachment)

This code works great in localmode.

When i'm trying that on my published web site, I get "The remote server returned an error: (403) Forbidden."

After read some articles, the problem seems to be because my website is using formauthentification.

With formauthentification it looks like I need to set authentification cookie to my HttpWebRequest object.

My problem is that I can't access to the CookieContainer property on my object.

request.cookieContainer return me that cookiecontainer is not a member of System.Net.WebRequest.

Why I'm not able to get access to this property?
What is my alternative?

Thanks a lot in advance.