VB.NET download file from HTTPS Bugs

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VB

I have a code for downloading file from HTTPS

Dim URI As String = "https://secure.ddcos.com/MOVEitISAPI/MOVEitISAPI.310/action=hu_downld!parm=e930810185440778334!NoAttach=1/98677_5050854223051_942963.jpg"
Dim oRequest As System.Net.HttpWebRequest = CType(HttpWebRequest.Create(URI), HttpWebRequest)
oRequest.Credentials = New System.Net.NetworkCredential("username", "password")
Using oResponse As System.Net.WebResponse = CType(oRequest.GetResponse, System.Net.WebResponse)
    Using responseStream As IO.Stream = oResponse.GetResponseStream
        Using fs As New IO.FileStream("D:\98677_5050854223051_942963.jpg", FileMode.Create, FileAccess.Write)
            Dim buffer(2047) As Byte
            Dim read As Integer
            Do
                read = responseStream.Read(buffer, 0, buffer.Length)
                fs.Write(buffer, 0, read)
            Loop Until read = 0
            responseStream.Close()
            fs.Flush()
            fs.Close()
        End Using
        responseStream.Close()
    End Using
    oResponse.Close()
End Using
MsgBox("done")

I can create a file but it has no data(0 byte) size, don't know why that happen

But when I use this site,

Dim URI As String = "https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.js"
oRequest.Credentials = New System.Net.NetworkCredential("", "")

I can download the file successfully,

So what's wrong with the above code? Any suggestion appreciated.

Thanks. . .


Revision:
I found something in the Internet, I don't know if this is correct.
ClientCertificate Collection[^]
To access to the Web Server(https), a Client Browser must send/have a ClientCertificate, so if that's the case how can I have a ClientCertificate?