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

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"];

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;

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the following codes show how to create dynamic
check boxes according to database data.also the
tricky part is that whether a check box will
be checked or not can be done by the code '$checked'.

following way a DataTable with data can be used to
populate gridview control in asp.net.following codes get files list
from a file path and adds in DataTable then sets that
DataTable as a DataSource of the GridView grdDirList.

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ajax control toolkit of asp.net