Disable / Prevent ASP.NET Caching

While we create an image/PDF on the fly, sometimes we will find when you request the second time, the file displayed is the cached file. The following code will disable Caching.

Response.Cache.SetNoServerCaching();
Response.Cache.SetCacheability(System.Web.HttpCacheability.Private);
Response.Cache.SetExpires(DateTime.MinValue);

In one stage, I tried "Response.Cache.SetNoStore();". It actually caused Content-Type not properly recognized. See the following article from Microsoft's website:

http://support.microsoft.com/default.aspx?scid=kb;en-us;812935

http://support.microsoft.com/?kbid=323308

Also, System.Web.HttpCacheability.Private is better than System.Web.HttpCacheability.NoCache, because NoCache means it's not saved in your disk as temporary file and would not be promote to be opened by Adobe Reader.