Avoid Caching of ASP Page

[vanisathish]

Hi All,
I am running IIS5.1. I am invoking an ASP page in ther server
continously from the HTML Page, to update some contents of the html
page. The ASP page seem to run from the cache sometimes(Not Always). I
tried to give the following header to my ASP file.

Response.Expires = 0
Response.AddHeader "pragma","no-cache"
Response.AddHeader "cache-control","private"
Response.CacheControl = "no-cache"

still the contents seem to get cached. how can i avoid this ?
appreciate your inputs.

thanks