using asp.net membership Probvider you can easily
make a user login using username and password and redirect to
default or any page by the following way -

beginners of .net programming can't guess sometime that
how easy is sending mail through .net.there are many ways
to do that.but i am writing here the easiest method to send
mail in c# with .net.It doesn't involve a lot's of coding.
all is built in and no more components.

It's a great idea to show application related tips
when users run your application.you may show tips
about how to use your application efficiently,details
of your application terms,etc.

In wordpress there are some error free ways to add scripts and styles
in your custom  page in admin dashboard.If you don't follow these rules you
might see errors and it's not a good idea to declare script and styles without
this kind of some pre-defined actions.

following are guidelines to develop modules
for dotnetnuke 5/6 with visual studio 2008/2010 -

I have given many interviews on c#,asp.net jobs and
went through the questions.here i am posting,It may
help you -

It's possible to insert any kind of content in wordpress post or page using
short codes, but if you want to inject/modify content in post in more
advanced manner then there is a alternative is using filter