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7.4

VB.NET problem using WebRequest.GetResponseStream to download a big file in GRPS/3G

Asked by eddielao in General Packet Radio Service (GPRS), Windows Mobile (Pocket PC / Win CE) Operating Systems, Windows MobileProgramming, .NET, Microsoft Visual Basic.Net

Tags: VB.NET WebRequest GetResponseStream GPRS 3G Download Slow

Any Experts Please Help!
I am using the following VB code in Window Mobile to download a 1M file from the web server.  It works very fast on Wi-Fi mode, less than 5 seconds, using my code or Internet Explorer, no discernable different.    
However, on GPRS/3G mode: it takes about 5 to 10 minutes to download the same file in IE, but my VB code took 17 or sometime 40 minutes to download the file.  The first 500K seems fast in about 4 minutes, still a bit slow when compare to IE, but the last 500 was so slow.  What am I missing?  Please help.  Thanks!
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Request = System.Net.WebRequest.Create(sURL)
            Response = Request.GetResponse
            ResponseStream = Response.GetResponseStream
            Dim numBytesToRead As Integer = CInt(Response.ContentLength)
            Dim bytes(Response.ContentLength) As Byte
            Dim numBytesRead As Integer = 0
            While numBytesToRead + 1 > 0
                Dim n As Integer = ResponseStream.Read(bytes, numBytesRead, numBytesToRead)
                 If n = 0 Then
                    Exit While
                End If
                numBytesRead += n
                numBytesToRead -= n
            End While
[+][-]05/06/09 07:34 AM, ID: 24315244Administrative Comment

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[+][-]05/06/09 07:38 AM, ID: 24315297Assisted Solution

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[+][-]05/06/09 07:56 AM, ID: 24315527Assisted Solution

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[+][-]05/06/09 10:31 AM, ID: 24317381Accepted Solution

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About this solution

Zones: General Packet Radio Service (GPRS), Windows Mobile (Pocket PC / Win CE) Operating Systems, Windows MobileProgramming, .NET, Microsoft Visual Basic.Net
Tags: VB.NET WebRequest GetResponseStream GPRS 3G Download Slow
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Solution Provided By: eddielao
Participating Experts: 3
Solution Grade: A
 
[+][-]07/22/09 07:56 AM, ID: 24915675Author Comment

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