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 -

in coding giving proper names to methods,classes,controls,
variables,others is neccessary and good programming practice.
think that a method name-show button click.

Asp.net caching helps you to create high performance applications.
you can cache objects like DataSets,or your created objects.you can
also do page level caching if you used user controls in the page
if your aspx page includes lots of work.

It's a good idea to use a class say gateway where all
database access codes will be written.in this gateway class
you will implement db connection as follows -

first create another class -

upgrading dnn website to upper version is easy.one
have to follow the following steps to do upgrading.

Gravatar.com is used to store one's avatar image according to email.
then if you comment in any application using your that email address
where gravatar image has been programmed then your avatar image will
be displayed in the application.