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looping HttpWebRequest hangs the program until it is finished

 
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My code is working but my only problem is that the entire program freezes while it is looping and the freeze only stops when the loop is done, is there any way to get rid of this freezing? i want to see it display from 1 to 21 but instead it freezes and only displays number 21 right away.

Here is my code. Should i change something so that it would tweak its performance? Thanks in advance

 Dim x As Integer = 0
    Do
        Dim POST As String = "authenticity_token=weZnH8V68yQSnQh91UtDZyatys%2FXtPQGN2vooyW4opY%3D&email%5Bto_address%5D=intes2010%40gmail.com&email%5Bfrom_name%5D=Test&email%5Bfrom_address%5D=test%40email.com&email%5Bnote%5D=today+is+a+big+success&email%5Bcopy_yourself%5D=0&id=house-of-pies-466226000"
        Dim request As HttpWebRequest
        Dim response As HttpWebResponse
        Dim tempCookies As New CookieContainer
        request = CType(WebRequest.Create("http://www.yellowpages.com/los-angeles-ca/mip/house-of-pies-466226000/send_email?lid=1000083727260"), HttpWebRequest)
        request.ContentType = "application/x-www-form-urlencoded"
        request.ContentLength = POST.Length
        request.Method = "POST"
        request.KeepAlive = True
        request.CookieContainer = tempCookies

        Dim requestStream As Stream = request.GetRequestStream()
        Dim postBytes As Byte() = Encoding.ASCII.GetBytes(POST)
        requestStream.Write(postBytes, 0, postBytes.Length)
        requestStream.Close()

        response = CType(request.GetResponse(), HttpWebResponse)
        tempCookies.Add(response.Cookies)
        Dim postreader As New StreamReader(response.GetResponseStream())

        Dim thepage As String = postreader.ReadToEnd
        RichTextBox1.Text = thepage
        response.Close()

        x = x + 1
        Label1.Text = x
    Loop While (x <= 20)
 
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put your code inside of threading
ex:
================
imports System.Threading
==================

------------------------
private sub sample

====YOUR CODE HERE=====

end sub
------------------------

then call your thread by putting this code inside of the button
--------------------------------------------------------------------
dim Sam as new System.Threading.Thread(Addressof sample): Sam.start
--------------------------------------------------------------------

in form load add this
--------------------------------------------
  CheckForIllegalCrossThreadCalls = False
--------------------------------------------

  its not the best way of using threading but it might work :)
You
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