As with many people asking questions related to the web here on CP, also you ought to learn to differentiate where what happens! ASP.Net runs on the web server. That is normally not the machine where the user looks at your web pages in a browser - though many developers do both things on the same one computer. The "save file dialog" is opened by the browser on the client - that is not an ASP.Net function.
If a web page wants to write some files onto my hard disk without asking me for permission, I would not trust it: I'd think of malware. Yes, there are security holes in many browsers allowing for such bad things, and they ought to get fixed as soon as possible.
In my application i have to use singleton class.. and also enough single worker process. case is, when i start a application, it has created then working and if have any crash occurred, worker process created new one so it(singleton object) has been created again.. now i want to modify this single object getting entire( worker process).. my idea is
1) Can we create separate service for single instance application for processing. with service to iis communication via tcp using wcf.
2) Can we assign that object to httpContext for keeping object to entire application. if i used this, its applicable all webservice method (ajax callback).. please clarify
Any other idea?? please give proper idea for this concept..