Asp dot net final (2)

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Asp dot net final (2)

  1. 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. 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 ASP.Net Presentation2
  3. 3. Objectives  Introduction to ASP.Net  Basic Advantages  Some Examples ASP.Net Presentation3
  4. 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! 4 ASP.Net Presentation
  5. 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. ASP.Net Presentation5
  6. 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()” ASP.Net Presentation6
  7. 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 ASP.Net Presentation7
  8. 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 ASP.Net Presentation8
  9. 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 ASP.Net Presentation9
  10. 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 ASP.Net Presentation10
  11. 11. .Net - Framework ASP.Net Presentation11
  12. 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 ASP.Net Presentation12
  13. 13. Preserving Data Across Pages  Session  InProc  StateServer  SqlServer  Cookies  Query String  Cookie Independent (Visual Studio 2010) ASP.Net Presentation13
  14. 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 ASP.Net Presentation14
  15. 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 ASP.Net Presentation15
  16. 16. Page Life Cycle Web Technologies16 ASPX Page Requested Request Page Start Initialization Load Post Back Event Handling Rendering Unload <html> … </html>
  17. 17. 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 Stalljohan​n
  18. 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. ASP.Net Presentation18
  19. 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 ASP.Net Presentation19
  20. 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 ASP.Net Presentation20
  21. 21. References  www.w3schools.com  www.codeproject.com  msdn.microsoft.com  CiL – Center for Innovative Learning Technologies, RWTH Aachen University 21 ASP.Net Presentation

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