Asp dot net final (2)

Server side technologies
ASP.Net
Amelina Ahmeti, Sultonmamad, Usman
Web Technologies – Prof. Dr. Ulrik Schroeder – WS 2010/111
The slides are licensed under a
Creative Commons Attribution 3.0 License

Overview
 ASP.Net v/s PHP
 The need for ASP.Net
 Introduction to ASP.Net
 .Net Framework
 .aspx and Code Behind files
 Page Life Cycle
 Controls
 State Management
 Configuration Files
ASP.Net Presentation2

Objectives
 Introduction to ASP.Net
 Basic Advantages
 Some Examples

Comparison with PHP
 Wide belief that PHP is faster
 ASP.Net is a platform
 Cost
 Web Server
 Propriety
 JIT (Just In Time) Compilation
 Discussed in Detail Later!
4 ASP.Net Presentation

ASP – Active Server Pages
 Server-side scripts
 Also client-side scripts
 Validate user inputs
 Access database
 ASP provides solutions for transaction processing and managing
session state.
 One of the most successful languages for Web development.

Problems with ASP
 Interpreted and Loosely typed code
 Late binding of Variables
 Uses Jscript or VBScript
 Mixes layout (HTML) and logic (scripting code)
 Frequent switches between HTML and ASP code
 Hard to separate Content and Business Logic
 Limited Development and Debugging Tools
 Visual InterDev, Macromedia helped
 Debugging done using “Response.Write()”

Problems with ASP
 No real state management
 Process Dependent
 Server Farm Limitations
 Cookie Dependent
 Update files only when server is down
 To update components based site you have to stop the server
 If not Application fails
 Obscure Configuration Settings
 Configurations stored in IIS Metabase
 Difficult to port application

ASP.Net – Issues to Address
 Make sure ASP runs fine
 Since ASP was widely used
 Had a very large programmer base
 Introduction of .Net Framework
 ASP.DLL not modified while installing framework
 IIS could run ASP and ASP.Net simultaneously
 Overcome the short comings in ASP

ASP.Net - Advantages
 Support for compiled languages
 Separation of Code from HTML
 Use services provided by the .NET Framework
 Easier Debugging using Visual Studio
 Graphical Development Environment
 Session Management
 Update files while the server is running!
 XML-Based Configuration Files

ASP.Net - Overview
 Server side technology
 Web Forms used to build Web Applications
 Provides services to create and use Web Services
 Controls
 HTML Controls
 Web Server Control
 User Controls
 Ease of application development

.Net - Framework

ASP.Net - Files
 A simple ASP.Net file consists of two files
 Presentation (.aspx)
 Code Behind (.aspx.cs for C#)
 Web Services have the extension .asmx
 Configuration Files
 Global.asax (also has a code behind file)
 Optional file containing global logic
 Also has a code behind file
 Web.config
 Application Configuration file
 Allows defining Name, Value pairs that could be accessed by application

Preserving Data Across Pages
 Session
 InProc
 StateServer
 SqlServer
 Cookies
 Query String
 Cookie Independent (Visual Studio 2010)

Execution Cycle
 Request aspx page
 ASP.Net runtime parses file for code to be compiled
 Generation of Page class (ASP.Net Page)
 Instantiates server controls
 Populates server controls
 Rendering of Controls
 Send the HTML to client browser

Execution Process
 Compiling the code
 First time request
 Code compiled to MSIL(Microsoft Intermediate Language)
 Similar to Assembly Language
 Used to achieve platform independency
 Not the target what Microsoft wants
 CPU independence
 Efficient conversion to Native code
 CLR(Common Language Runtime) compiles the code
 A copy of Page is Cached
 Used until changes are made to the page, and it needs to be compiled again
 Updating the page causes a re-build

Page Life Cycle
Web Technologies16
ASPX Page Requested
Request
Page
Start
Initialization
Load
Post Back Event Handling
Rendering
Unload
<html>
…
</html>

Web Browser
15/10/2010 ASP.Net Presentation17
Just-In-Time Compilation
ASPX
File
Code
Behind
Page
Class
File
ASPX
Engin
e
Page
Class
Request #1
Request #n
Courtesy:
Patrick
Stalljohann

ASP.Net Controls
 HTML server controls
 HTML elements programmable in server code.
 HTML tags are left as is by compiler
 Web server controls
 Defined as Abstract controls
 Have more built-in features than HTML controls e.g. Calendar,
Menus etc.
 Validation controls
 Perform client side validation
 Can be used to build own validators
 User controls
 Controls created by the User as ASP.Net webpages
 Re-usability and Power to User.

Global.asax
 Declare application level Events and Objects
 Code for events like
 Application Start
 Application End
 Session Start
 Session End
 Since this code cannot be placed in application itself
 Also used for Application and Session State Management
 Compiled just like any other ASP.Net page

Web.config
 Stores configuration information in XML format
 Optional
 Allows for creating Name, Value pairs that could be accessed
by the web application to apply configurations
 Portable

References
 www.w3schools.com
 www.codeproject.com
 msdn.microsoft.com
 CiL – Center for Innovative Learning Technologies, RWTH Aachen
University
21 ASP.Net Presentation

Asp dot net final (2)

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