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.

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.

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 -

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

in some way these codes will help you very much if you need
to know file extension.
method below returns true if extension are any of the following -