n your asp.net application/website you can count
how many visitors are browsing your website easily.
for this add a Global.asax file in your website.
then add the following codes in that file -

HttpCookie is a very good way to store small amount of data
in asp.net application/website.you can access cookie value in
any page once set in a page.cookie can stay for long time in the
user's computer.

in asp.net application or website </appSettings>
section in web.config is used to store application
setting to be used.you can keep settings in this
section as -

you should backup your database file of your
windows software.there are many reasons why you
will backup your database file.i will not write
details about that.i showing here how to
backup your database file for safety of your
database -