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Asp dot net long
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. Commonly used objects
The brain:
Client
Server
File and folder
License
Web Technologies2
<html>
…
</html>
Can you ask a
clever question?
3. Overview
The need for ASP.Net
Introduction to ASP.Net
.Net Framework
.aspx and Code Behind files
Page Life Cycle
Controls
State Management
Configuration Files
Some Examples
ASP.Net v/s PHP
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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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7. 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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8. 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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10. ASP.Net – Issues to Address
Make sure ASP runs fine
Since ASP was widely used
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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11. ASP.Net – Advantages
Separation of Code from HTML
Completely separate Presentation from Business Logic
Examples
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19. ASP.Net - Advantages
Support for compiled languages
Strong typing
OOP
Pre-compilation to Byte Code and JIT compilation
Subsequent requests directed to cached copy until source changes
Mostly used languages are
VB.Net
C#
Use services provided by the .NET Framework
Class libraries provided for different tasks
Data Access
Access to Operating system
Input / Output
Debugging made a lot easier
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20. ASP.Net - Advantages
Graphical Development Environment
Drag and Drop Controls
Set the properties graphically
IntelliSense Support
Code (VB.Net/C#)
HTML
XML
State Management
Problems with ASP state management addressed
Can be recovered even if connection is lost
Discussed in detail later
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21. ASP.Net - Advantages
Update files while the server is running!
Components could be updated while Application is running
Server automatically starts using new version
Old version kept in memory until the clients have finished
XML-Based Configuration Files
Easy to read and modify
Ease in application portability
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22. 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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25. 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
Web.config
Application Configuration file
Allows defining Name, Value pairs that could be accessed by application
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26. 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
HTML generation by painting of controls
Send the HTML to client browser
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27. 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
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29. Page Request
IIS determines what type of request it is.
ASP.Net requests are forwarded to ISAPI
Decision is made to either parse or compile the page
Or we could just render an existing copy in the Cache.
30. Start
ASP.Net Environment is created
If the Application has been called first time then the
Application Domain is created
Page Objects are created
Request
Response
Context
Set the IsPostBack property
31. Initialization
Server Controls on the page are initialized
UniqueID of each control is set
Skins are applied to controls
Master Page and themes are applied
32. Load
ViewState is re-constituted
Controls are loaded with data from ViewState and Control
State if this is a PostBack request
33. PostBack Event Handling
Event handlers for server controls are called.
Validation controls perform their validation on the data in
the controls and set IsValid property of each Validation
Control and the Page.
34. Rendering
ViewState is saved for the page and controls.
Page calls the Render method of all the server controls, and
they all render themselves on the page.
This rendering is done in the OutputStream object of page’s
Response Property, and the HTML output is generated.
35. Unload
Page specific properties are unloaded
Request
Response
Clean up is performed.
37. ASP.Net Controls
HTML server controls
Web server controls
Validation controls
User controls
38. HTML Server Controls
HTML elements on an ASP.NET Web page are not available
to the server.
treated as opaque text and passed through to the browser.
HTML elements containing attributes that make them
programmable in server code.
39. Web Server Controls
A second set of controls designed for a different emphasis
Do not necessarily map one-to-one to HTML server controls
Defined as Abstract controls
Have more built-in features than HTML controls e.g.
Calendar, Menus etc.
40. Validation Controls
Do client side validation like
Input required for a text box
Test against a specific value
Test a specific pattern for input
Whether a value lies within some range
Etc.
41. User Controls
Controls created by the User as ASP.Net webpages
Can be embedded in other pages
Re-usability and Power to User.
43. Post Back
Server controls
Post Back to the same page
Server control initiated request
44. View State
Persist state across PostBacks (Same Page)
Programmatic changes to the page's state
No free lunches
Cost of ViewState
Extra time in rendering
45. Preserving Data Across Pages
Session
InProc
StateServer
SqlServer
Cookies
QueryString
Cookie Independant
47. Global.asax
Declare application level Events and Objects
Code for events like
Application Start
Application End
Since this code cannot be places in application itself
Also used for Application and Session State Management
Compiled just like any other ASP.Net page
Subsequent compiles made on changes
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48. 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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50. Believed that PHP is faster
No proof available
ASP.Net is a platform
C#/VB.Net used for server operation
ASP.Net provides controls and designing tools
PHP contains scripting tags, and no controls
Cost
Microsoft Platform
Platform Compatibility
CLR but not IIS
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51. Database connectivity
PHP used for DB connectivity
ASP.Net uses Framework to access DB
Object Oriented Design
ASP.Net is built on OOP paradigm
PHP supports minimal level OOP
Compilation
PHP
HTML and PHP to Zend Opcodes
Zend Engine generates HTML
ASP.Net
MSIL
Page Rendering
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52. Web Server
PHP
Runs on both IIS and Apache, hence platform independent
ASP.Net
Runs only on IIS
Data Security
ASP.Net has enhanced and enriched features
PHP lesser features
Propriety
PHP is open source
ASP.Net is Microsoft Product
Some new tools like in AJAX are open source
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