IE7 turn off cache programmatically

I had an issue with this even in IE6....one way around it...that works really consistently...is when you do the export, and set the filename of the pdf, add a random number to the end of the file name, or I used the full date (including date,hours, minutes,seconds, milliseconds). so it would go from:
filename.pdf

to something like:
filename_200802060819105.pdf

...that way, the files in the user's browser cache won't ever be the same filename...

There is no solution for IE7 to turn off the out of date cache?? or turn it off myself with code? I will adopt your solution if there is nothing better. Thank you for responding.

As you generate the report you could force a refresh of the data through a command to the report object
  RptObj.Refresh

I don't know exactly how you specify that in ASP.

mlmcc

The application overwrites the previous report which is on the server and opens a new browser windows that points to the new report on the server. But ie uses the report in the cache at the user's box (Temporary Internet Files). No amount of refreshing to the new report could change that since, thanks to the cache, ie picks up the wrong report. If you know maybe how to force a cache refresh or turning off cache for my app would be helpful. I modified IIS in the server in the tab HTTP Headers by checking "Enable Content Expiration" and selecting Expire after 1 minute. That is not ideal because I wish it to give me the option in seconds. If I use the option Expire Immediately the report flickers and does not show at all. I think it is still ie trying to run the cache instead of the actual report it is told to open.

I cleared the browser cache but it returns the same file with the same date of creation. I don't really understand but I will adopt your answer because I know it will work. Thank you