Actually there is a temp folder, but what you usually do is save the downloaded file in code (if you are talking about ASP.NET):
Aspx file:
<asp:FileUpload ID="FileUpload1" runat="server" />
CS file:
FileUpload1.SaveAs("C:\\YOUR LOCATION\\" + FileUpload1.FileName);
If you need to install a temporary folder folder for any other reason (which is possible), please specify.
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