Introduction to asp.net

How asp page is displayed?
2. Server searches
for and retrieves
file from hard
drive. If there is
asp code then it is
processed
3. Server returns file to
your computer.
1.Browser requests file from
server4.Your browser
interprets the asp file
and displays it

 provides various building blocks of ASP.net pages.
It describes:
•Server side counterparts of almost all HTML elements or
tags such as <form> and <input>.
• Server controls, which help in developing complex user-
interface. Eg: the calender control or the gridview control.

(1)Common Language Runtime or CLR :
It performs memory management, exception handling, debugging, security
checking, thread execution, code execution, code safety, verification, and
compilation.
The code that is directly managed by the CLR is called the managed code.
When the managed code is compiled.
The compiler converts the source code into a CPU independent intermediate
language (IL) code.
A Just-In-Time (JIT) compiler compiles the IL code into native code, which is
CPU specific .
(2) .Net Framework Class Library:
It contains a huge library of reusable types, classes, interfaces, structures.
(3) Common Language Specification:
It contains the specifications for the .Net supported languages
(4) Common Type System :
It provides guidelines for declaring
It manages types at runtime, and cross-language communication.

5) Metadata and Assemblies:
Metadata is the binary information describing the program
It is either stored in a portable executable file (PE) or in the memory.
 Assembly is a logical unit consisting of the assembly manifest, type
metadata, IL code, and a set of resources like image files.
(6) Windows Forms:
It contains the graphical representation of any window displayed in
the application.
(7) ASP.NET and ASP.NET AJAX :
ASP.NET is the web development model and
AJAX is an extension of ASP.NET for developing and implementing
AJAX functionality.
(8) ADO.NET :
It is the technology used for working with data and databases.
It provides access to data sources like SQL server, OLE DB, XML etc.
(9) LINQ :
It imparts data querying capabilities to .Net languages using a syntax
which is similar to the tradition query language SQL.

Basically, it is divided into two groups:
Application Life Cycle
Page Life Cycle

User requests an application resource from the
Web server.
ASP.NET receives the first request for the
application.

ASP.NET core objects are created for each request.
ASP.NET creates and initializes core objects such as
HttpContext, HttpRequest, and HttpResponse.
 The HttpContext class contains objects that are specific to the
current application request, such as the
HttpRequest and HttpResponse objects.
The HttpRequest object contains information about the
current request, including cookies and browser information.
 The HttpResponse object contains the response that is sent to
the client, including all rendered output and cookies.
After all core application objects have been initialized, the
application is started by creating an instance of
the HttpApplication class.

The request is processed by the HttpApplication
pipeline

Init event initializes the control
property and the control tree is
built.
InitComplete event allows
tracking of view state.
PreLoad occurs
before the post
back data is
loaded in the
controls.
The Load event is raised for the page first
and then recursively for all child controls.
The controls in the control tree are
created.
The PreRender event occurs just
before the output is rendered.
The UnLoad phase is the last phase of
the page life cycle. It raises the UnLoad
event for all controls recursively and
lastly for the page itself. Final cleanup is
done and all resources and references,
such as database connections, are freed.
State of control on
the page is saved.
Personalization,
control state and
view state
information is
saved. The HTML
markup is
generated.
The loading
process is
completed,
control event
handlers are
run, and page
validation takes
place.

Objects Description
Application Object Describes the methods, properties, and collections of the object that stores information
related to the entire Web application, including variables and objects that exist for the
lifetime of the application.
ASPError Object Describes the properties of the object that stores information about an error condition.
Request Object Describes the methods, properties, and collections of the object that stores information
related to the HTTP request. This includes forms, cookies, server variables, and certificate
data.
Response Object Describes the methods, properties, and collections of the object that stores information
related to the server's response. This includes displaying content, manipulating headers,
setting locales, and redirecting requests.
Server Object With these methods you can execute code, get error conditions, encode text strings, create
objects for use by the Web page, and map physical paths.
Session Object Describes the methods, properties, and collections of the object that stores information
related to the user's session, including variables and objects that exist for the lifetime of the
session.

Introduction to asp.net

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