Check to see if a file exists on a virtual directory across the internet

I am trying to check if a file exists in a virtual directory.  I tried File.Exists but it always returns false.  I am trying to see if the file exists so I can turn a control on or off.  

I am using IIS 6.0, VS 2008.  

I have attached a sample of my code below.
www.awebsite.com/billimages is defined as a virtual directory in IIS as an application.
I tried it with "Read" and "Directory Browsing" turned on.
DocPath = "http://www.awebsite.com/billimages/<dir>/<YYYYMM>/filename.pdf"

If File.Exists(DocPath) Then
                Me.GetFBPdf.commandname = docpath
                Me.GetFBPDF.Text = "View the FB Docs"
                Me.GetFBPDF.Visible = True
                FBFile = True
            Else
                Me.GetFBPDF.Visible = False
                FBFile = False
            End If

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mkacosAsked:
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ina_donConnect With a Mentor Commented:
If you are attempting to do this over the internet then the best thing is to attempt to download the file. A few example projects exist online that can act as a guide

http://www.vbdotnetheaven.com/UploadFile/bfarley/FileDownload04182005043858AM/FileDownload.aspx
http://www.vbforums.com/showthread.php?t=396260
http://blogs.techrepublic.com.com/programming-and-development/?p=695

I'm pressed for time to try knock together the code but you should get the direction...
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_bmendozaCommented:
do you know the physical directory of the file?
if yes please try something like.
DocPath = "C:\Inetpub\wwwroot\<dir>\<YYYYMM>\filename.pdf"
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mkacosAuthor Commented:
bmendoza - The actual path is not available to the user since it is being accessed through the web.

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mkacosAuthor Commented:
Ina_Don

Almost works.  Actually, it works great on my developpment computer but fails on the web site.  No, it does not fail I just need to find out where I can write a file on the end users computer.    I hard coded c:\windows\temp but I do not believe my application can write to the end users file system.

I am looking for a folder I can create then delete the temp file.  Any suggestions?
' Attempt a download to see if the file exists ****************
            DocPath = "http://www.AWebSite.com/BillImages/" & Carrier & "/" & format(Shipdate, "yyyyMM") & "/" & PRO & ".pdf"
            Dim FileisThere As Boolean = False

            Dim imageAddress As String = String.Empty
            Dim filename As String = String.Empty
            Try
                Dim fileReader As New WebClient()
                imageAddress = DocPath
                filename = format(Date.now, "MMddhhss") & ".tmp"
                If Not (System.IO.File.Exists("c:\windows\web\" + filename)) Then
                    fileReader.DownloadFile(imageAddress, "c:\" + filename)
                End If
                System.io.file.delete("c:\windows\temp\" + filename)
                Fileisthere = True
            Catch ex As HttpListenerException
                Fileisthere = False
            Catch ex As Exception
                Fileisthere = False
            End Try

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mkacosAuthor Commented:
I had to add  Dim foldername As String
        Dim fs
        fs = Server.CreateObject"Scripting.FileSystemObject")
 foldername = fs.GetSpecialFolder(2).path
  fs = Nothing
to get it to find the tem path but it worked.
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ina_donCommented:
So are you alright now. I didn't have a chance to respond and I see you have already responded to the problem yourself!!?
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mkacosAuthor Commented:
Yes, your response was very helpful.  Thanks
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