How to set BaseUrl from ASP.NET Code-behind?

Storing BaseDir/BaseUrl settings in a cookie doesn't seem to be secure to me. After all, user may try to modify cookie and put there his own values.

If you can't use session, how about doing it this way:
- assign random uniqueId to baseUrl/basePath combination and save it in db (e.g. dfR5t6g6hXc = "/ckfinder/userfiles"/)
- set the CKFinderId property, it will be passed later to the server connector (it will be appended to the url)
- in the configuation file read Request.QueryString[ "id" ] and load valid BaseUrl from db

Here's an example that shows how to set CKFinderId property (see documentation).

CKFinder.FileBrowser _FileBrowser = new CKFinder.FileBrowser();
...
_FileBrowser.CKFinderId = "dfR5t6g6hXc" ;
...
_FileBrowser.BasePath = "/ckfinder/" ;
_FileBrowser.SetupFCKeditor( FCKeditor1 );