this post will show how to create a file in dotnetnuke module
directory and write some data in the file.you can use this
technique in asp.net application too -

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 -

if you have a asp.net web page which is derived
from a master page then you may have trouble
using a form inside your page.It happens because
of your master page using a form.It's a little tricky
to be able to use another form which you need to use.
you have to use a javascript line for that.

sometimes it's needed to check whether there are multiple same
modules in the current page or not to keep one version of the
module or some other checks.