if we need some fields from different tables
temporarily in our software or application then

following codes shows how to use GridView control.Its a
simple example.

in app main file -

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

when you submit form with input and select
controls,the values of these controls are
passed with form.we get these as POST var-
$_POST["controlname"];

session is a essential part of joomla. It's main use
is for remembering user login, also there are many
usage of it.

Today ajax is being a common part in most large website and
application.user loves the way everything done without page
refresh and website's with ajax implemented is getting higher
popularity.in the following i showed how to use ajax in asp.net
web page.you can use in php too -

It's very common purpose when it comes to insert advertising scripts
or other html codes in a joomla article.you can easily create a plugin
which can insert your code after title or content or before content
of the article.Following way i demonstrate how to achieve
this great task -