[2008] VB.NET - Form Posting And Cookies

I am currently trying to write an application which which can access certain links on a website. The website is protected by forms authentication and cookies. I have managed to pass the login information correctly as outlined in the code below.

Code:

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Dim CookieContainer As New CookieContainer

        Dim URL As String = "HTTP URL GOES HERE"

        Dim strPost As String = "POST_DATA_GOES HERE"

        Dim myWriter As StreamWriter

        Dim objRequest As HttpWebRequest = CType(WebRequest.Create(URL), HttpWebRequest)

        Dim cookies As CookieContainer = New CookieContainer

        'objRequest.AllowWriteStreamBuffering = True

        objRequest.Method = "POST"

        objRequest.ContentType = "application/x-www-form-urlencoded"

        objRequest.CookieContainer = cookies

        myWriter = New StreamWriter(objRequest.GetRequestStream())

        myWriter.Write(strPost)

        myWriter.Close()

        Dim objResponse As HttpWebResponse = CType(objRequest.GetResponse(), HttpWebResponse)

        Dim str As StreamReader

        str = New StreamReader(objResponse.GetResponseStream)

        ' rtbresponse.Text = str.ReadToEnd

        myWriter.Close()

        objRequest.GetResponse().Close()

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When I try to access another page on the same webserver, I am redirected back to the login page. Is there a way to share the stored cookies which each link that I visit?