Ajax is the best technique for showing & updating
data without page refresh.
jquery ajax make things possible easier way.in this
post i will show how to pass data via jquery ajax
and get back data.

List<> can be used as a collection of objects which
can be accessed by index.List originated from
System.Collections.Generic class.List objects can
be sorted,searched,manipulated.so List is very
useful in programming for holding any type of
objects.following shows a example of List<> -

asp.net has default password recovery control and methods
to implement password recovery.you just need to use
asp.net membership provider in your app and add the
PasswordRecovery control in a page by which you want
to recover password.

ASP.NET controls automatically keep their data
when page is sent to the server in response to
events (like a user clicking a button).
this persistence of data is called view state

sometimes needed that html tags from a html string
to be removed.there are many purposes to do that.
there are many ways this can be achieved in client side
using jquery and javascript -

by the following way you can resize a image to a predefined
dimension and resolution.you can also use it to make a image
thumbnails.

if you want to read get/read data from a file according to
querystring using StreamReader then following codes will
help you.It is very useful in some case.here i get data from
a ashx file according to query string i pass to the file -