In asp.net how to delete a pdf file you just created for a user to view

I have a asp.net page that generates a pdf file on the fly for a user and then immediately opens it for them in their adobe reader.  the problem is, I'm unable to delete it while they have the pdf open , because i get an access denied.   so now i basically have tons of pdf files in this directory that they are stored in, and wonder if there is any easy way to delete these pdf files upon a user viewing it.  

and no, i do not want to run a separate windows service or anything else that would clean the temp directory.
mocaivAsked:
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Ted BouskillSenior Software DeveloperCommented:
Don't write the file to disk.  Use Response.OutputStream to write the file directly via the Response object to the HTTP stream.
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Ted BouskillSenior Software DeveloperCommented:
Assuming you have a document object in memory that holds your dynamically generated PDF the following code shows how to write it to the stream.
// clear http output
Response.Clear();
// set the content type to PDF
Response.ContentType = "application/pdf";
// add content type header
Response.AddHeader("Content-Type", "application/pdf");
// set the content disposition
Response.AddHeader("Content-Disposition", "inline;filename=Filename.pdf");
// write the buffer with pdf file to the output
document.Save(Response.OutputStream);

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mocaivAuthor Commented:
what is document?

i have a function that returns io.memorystream
and theres no Save method for an insantiated memorystream
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Ted BouskillSenior Software DeveloperCommented:
yourMemoryStream.WriteTo(Response.OutputStream);
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