Introducing asp

• Communication process between browser and server
• Web Server / Web Browser’s Role
• Understanding the role of HTTP
• Creating File System , FTP, Local, Remote HTTP based
websites
• Anatomy of an ASPX Page
• Single-File vs. Code Behind Pages
• Website Compilation
• Working with Web Configuration Files

1. A user uses his or her Web browser to initiate a request for a
Web server resource.
2. HTTP is used to send a GET request to the Web server.
3. The Web server processes the GET request on the server
(typically locating the requested code and running it).
4. The Web server then sends a response back to the Web
browser. The HTTP protocol is used to send the HTTP
response back to the Web browser.
5. The user’s Web browser then processes the response (typically
HTML and JavaScript) and renders the Web page for display
to the user.

6. The user may then enter data and perform an action such as
clicking a submit button that causes his or her data to be sent
back to the Web server for processing.
7. HTTP is used to POST the data back to the Web server.
8. The Web server then processes the POST request (again, calling
your code in the process).
9. The Web server then sends a response back to the Web browser.
HTTP is used to send the HTTP response to the Web browser.
10. The Web browser again processes the response and displays
the Web page to the user.

• HTTP is a text based communication protocol that is used to
request Web pages from Web Server and send the response
back to browser
• HTTP messages are sent between port 80 or 443

• A typical command looks like this
GET /default.aspx HTTP 1.1
Host www.microsoft.com

• The communication from browser to server is known as
REQUEST and that from server to browser is RESPONSE
• A Response looks like this :

HTTP/1.1 200 OK
Server : Microsoft-IIS /7.5
Content-Type: text/html
Content-Length: 38
<html><body>Hello </body></html>

There are two HTTP methods that can be used to submit the form
data back to the Web server: GET and POST.
When the GET verb is used, the form data is appended to the URL
as part of the query string.
GET /getCustomer.aspx?Id=123&color=blue HTTP/1.1
Host: www.northwindtraders.com

When the POST verb is used, the data is placed into the message
body of the request as follows:
POST /getCustomer.aspx HTTP/1.1
Host: www.northwindtraders.com

Id=123&color=blue

The typical .aspx page includes three sections: page
directives, code, and page layout.

Page directives This section is used to set up the
environment, specifying how the page should be processed. For
example, this is where you can indicate an associated code
file, development language, transaction, and more.
Code This section contains code to handle events that execute on
the server based on the ASP.NET page processing model.
Page Layout The Page layout is written using HTML. This
includes body, markups and style information

In the single-file model, the compiler generates a new class for
your page. This class inherits from the base Page class. It is
typically named with the format ASP.pagename_aspx. This
class contains control declarations, event handlers, and related
code you have written for your page.

The code-behind programming model physically separates your
user interface layout markup and your server-side code into two
distinct files. In this case the .aspx page contains your layout
markup and the related .aspx.cs or .aspx.vb file contains the
associated code.

Most of the Web Applications are not pre-compiled.
Instead, pages and codes are typically copied to a Web
Server and then dynamically compiled the first time they
are requested by a user.

Web applications can also be pre-compiled using Build-
>Publish Website option in Visual Studio. In this case the
entire website is compiled, error checked and only layout
code and associated assemblies are copied to the server

Pro: The entire application need not be recompiled. Only
the changed web page is replaced.

Con: The first request will be slower and source code is to
be deployed to the server

Pro: Since entire application is compiled and error checked
it provides verification that all the pages and their
dependencies can be compiled.
Performance for the first user request is improved

Con: Simply copying the code files is simpler as compared
to pre-compilation.

• Configuration files allow you to manage the many settings
related to your Web site.

• Each file is an XML file (with the extension .config) that
contains a set of configuration elements. The elements
define options such as security information, database
connection strings, caching settings, and more.

• A given site might actually be configured with multiple
.config files.

• Configuration files are applied to an executing site based
on a hierarchy.
• There is a global configuration file for all sites on a given
machine called Machine.config. This file is found in the
• %SystemRoot%Microsoft.NETFramework<versionNum
ber>CONFIG directory.
• The next file in the hierarchy is root default Web.config file
located in the same directory
• The root directory of each website also contain a
Web.config file.
• Finally each subfolder can optionally contain its own
config file

Because they are XML files, the configuration files can be
opened and modified with any text editor or XML editor.
Visual Studio 2008 also provides the Web Site Administration
Tool (WSAT), which can be used to modify many of the
configuration file settings.

The WSAT allows you to edit the following categories of the
configuration files:
Security This setting allows you to set up security for your
Web site. In this category, you can add users, roles, and
permissions for your Web site.

Application Configuration This category is used to modify
the application settings.

Provider Configuration This configuration file contains
settings that allow you to specify the database provider to use
for maintaining membership and roles

Introducing asp

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