This document provides an overview of server-side ASP.NET technologies. It compares ASP.NET to PHP, discusses the problems with classic ASP that ASP.NET aimed to address, and outlines key ASP.NET concepts like the .NET framework, ASPX files and code-behind files, page lifecycle, controls, state management, and configuration files. The document also covers ASP.NET execution process, advantages over classic ASP, and references additional resources for further information.

1. 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

2. 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
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3. Objectives
 Introduction to ASP.Net
 Basic Advantages
 Some Examples
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4. 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!
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5. 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.
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6. 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()”
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7. 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
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8. 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
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9. 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
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10. 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
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11. .Net - Framework
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12. 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
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13. Preserving Data Across Pages
 Session
 InProc
 StateServer
 SqlServer
 Cookies
 Query String
 Cookie Independent (Visual Studio 2010)
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14. 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
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15. 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
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16. Page Life Cycle
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ASPX Page RequestedASPX Page Requested
Request
Page
StartStart
InitializationInitialization
LoadLoad
Post Back Event HandlingPost Back Event Handling
RenderingRendering
UnloadUnload
<html>
…
</html>

17. Web BrowserWeb Browser
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Just-In-Time Compilation
ASPX
File
ASPX
File
Code
Behind
Code
Behind
Page
Class
File
Page
Class
File
ASPX
Engin
e
ASPX
Engin
e
Page
Class
Page
Class
Request #1Request #1
Request #nRequest #n
Courtesy:
Patrick
Stalljohann​
Courtesy:
Patrick
Stalljohann​

18. 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.
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19. 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
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20. 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
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21. References
 www.w3schools.com
 www.codeproject.com
 msdn.microsoft.com
 CiL – Center for Innovative Learning Technologies, RWTH Aachen
University
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