allowing file download in asp.net

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ASP.NET

hi i have a webpage in my application that allows users to download a file.
for that i hv written the following code:

Dim fullpath As String = filename


       Dim name = Path.GetFileName(fullpath)
       Dim ext = Path.GetExtension(fullpath)
       Dim type As String = ""
       Try
           If Not IsDBNull(ext) Then
               ext = LCase(ext)
           End If
           Select Case ext
               Case ".txt"
                   type = "text/plain"
               Case ".doc", ".rtf"
                   type = "Application/msword"
               Case Else
                   type = "text/plain"
           End Select
           If (forceDownload) Then  
               Response.AppendHeader("content-disposition", _
               "attachment; filename=" + name)
           End If
           If type <> "" Then
               Response.ContentType = type 
           End If
           Response.WriteFile(fullpath) 
           Response.End() 'creates an property evaluation failed exception

this code works fine ..but response.end() raises an ThreadAbortException.
also if i use HttpContext.Current.ApplicationInstance.CompleteRequest() or response.flush()
then the htmlcode of the current page also comes in the downloaded file.

can anyone suggest me an alternative


i also want to delete the file from the server as soon as it is downloaded.
for this i tried writing the

file.delete(filepath)

but if it is written before response.end the page keeps on processing and no dialog box appears.
if i write it after response.end it is not executed since the execution of the page ends.

can any one suggest something...

thanks in advance