getting dnn user information from dotnetnuke module is
easy.

you can get dotnetnuke user's User Credentials
and Profile data by the following way -

you can create custom navigate url in dotnetnuke to send the url or
use it as a querystring in another page by the following way -

exporting to data in excel is a very common practice
in business website.one can use asp.net Response methods
to export to excel which is easy to do using a gridview.but
contents not appear properly like there will be white back-
ground over excel rows and this way is not efficient too.

If you used itemtemplate for items in datalist control then
you can easily delete,edit and then update items
using edititemtemplate.to do that add a itemtemplate and
edititemtemplate in the datalist.also you have to add
command buttons and command event handlers -

Its easy to implement OnCheckedChanged event of RadioButton
control but most programmers makes mistake by not
including AutoPostBack="True" property in radiobutton
control.sometimes OnCheckedChanged not works for that
reason.here are the full working codes -

following are some practice problems for c#.net
programmers.teachers try it in classes.students
or novice c# programmers solve those problems to
practice c# programming in -

you may need to register javascript file/css file from code
behind when needed.for this follow the codes below -