writing crystal report to reponse using ExportToHttpResponse only works with server.transfer

Hi all,
Im trying to show a crystal report in pdf format in the browser but something very odd is going on and i cant work out why.

I have a page which lists reports (Reports.aspx)
I found the code below to generate a report in PDF format.
This code works fine when i have the code in a button click event in Reports.aspx.

People want the report in a different page so they can view a report,go back,choose another, go back etc..
So I created a new page (GenerateReport.aspx) put the code in page_load and did a reponse.redirect to GenerateReport.aspx in the button click event instead.
For some reason this doesnt work anymore! It just shows a blank screen.

I tried the code in page_load of the Reports.aspx page and it wont work either.
Even odder, if i change the Response.Redirect to Server.Transfer() it works!

I thought I could get away with Server.Transfer but users are closing the report window or clicking back and getting taken to the wrong page because Server.Transfer doesnt do a new request. Ive no idea why it works one way and not the other!
Has any one any ideas at all?
Thanks!!

IList<ReportData> myData = GetReportData();
CrystalReport1 myCrystalReport = new CrystalReport1();
myCrystalReport.SetDataSource(myData);

Response.Buffer = false;
Response.ClearContent();
Response.ClearHeaders();
myCrystalReport.ExportToHttpResponse(ExportFormatType.PortableDocFormat, Response, false, "ExportedReport");

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