Asp dot net final (1)
- 1. Server side technologies ASP.Net Amelina Ahmeti, Sultonmamad, Usman Web Technologies â Prof. Dr. Ulrik Schroeder â WS 2010/111 The slides are licensed under a Creative Commons Attribution 3.0 License
- 2. Overview ď˝ ASP.Net v/s PHP ď˝ The need for ASP.Net ď˝ Introduction to ASP.Net ď˝ .Net Framework ď˝ .aspx and Code Behind files ď˝ Page Life Cycle ď˝ Controls ď˝ State Management ď˝ Configuration Files ASP.Net Presentation2
- 3. Objectives ď˝ Introduction to ASP.Net ď˝ Basic Advantages ď˝ Some Examples ASP.Net Presentation3
- 4. Comparison with PHP ď˝ Wide belief that PHP is faster ď˝ ASP.Net is a platform ď˝ Cost ď˝ Web Server ď˝ Propriety ď˝ JIT (Just In Time) Compilation ď˝ Discussed in Detail Later! 4 ASP.Net Presentation
- 5. ASP â Active Server Pages ď˝ Server-side scripts ď˝ Also client-side scripts ď˝ Validate user inputs ď˝ Access database ď˝ ASP provides solutions for transaction processing and managing session state. ď˝ One of the most successful languages for Web development. ASP.Net Presentation5
- 6. Problems with ASP ď˝ Interpreted and Loosely typed code ď˝ Late binding of Variables ď˝ Uses Jscript or VBScript ď˝ Mixes layout (HTML) and logic (scripting code) ď˝ Frequent switches between HTML and ASP code ď˝ Hard to separate Content and Business Logic ď˝ Limited Development and Debugging Tools ď˝ Visual InterDev, Macromedia helped ď˝ Debugging done using âResponse.Write()â ASP.Net Presentation6
- 7. Problems with ASP ď˝ No real state management ď˝ Process Dependent ď˝ Server Farm Limitations ď˝ Cookie Dependent ď˝ Update files only when server is down ď˝ To update components based site you have to stop the server ď˝ If not Application fails ď˝ Obscure Configuration Settings ď˝ Configurations stored in IIS Metabase ď˝ Difficult to port application ASP.Net Presentation7
- 8. ASP.Net â Issues to Address ď˝ Make sure ASP runs fine ď˝ Since ASP was widely used ď˝ Had a very large programmer base ď˝ Introduction of .Net Framework ď˝ ASP.DLL not modified while installing framework ď˝ IIS could run ASP and ASP.Net simultaneously ď˝ Overcome the short comings in ASP ASP.Net Presentation8
- 9. ASP.Net - Advantages ď˝ Support for compiled languages ď˝ Separation of Code from HTML ď˝ Use services provided by the .NET Framework ď˝ Easier Debugging using Visual Studio ď˝ Graphical Development Environment ď˝ Session Management ď˝ Update files while the server is running! ď˝ XML-Based Configuration Files ASP.Net Presentation9
- 10. ASP.Net - Overview ď˝ Server side technology ď˝ Web Forms used to build Web Applications ď˝ Provides services to create and use Web Services ď˝ Controls ď˝ HTML Controls ď˝ Web Server Control ď˝ User Controls ď˝ Ease of application development ASP.Net Presentation10
- 11. .Net - Framework ASP.Net Presentation11
- 12. ASP.Net - Files ď˝ A simple ASP.Net file consists of two files ď˝ Presentation (.aspx) ď˝ Code Behind (.aspx.cs for C#) ď˝ Web Services have the extension .asmx ď˝ Configuration Files ď˝ Global.asax (also has a code behind file) ď˝ Optional file containing global logic ď˝ Also has a code behind file ď˝ Web.config ď˝ Application Configuration file ď˝ Allows defining Name, Value pairs that could be accessed by application ASP.Net Presentation12
- 13. Preserving Data Across Pages ď˝ Session ď˝ InProc ď˝ StateServer ď˝ SqlServer ď˝ Cookies ď˝ Query String ď˝ Cookie Independent (Visual Studio 2010) ASP.Net Presentation13
- 14. Execution Cycle ď˝ Request aspx page ď˝ ASP.Net runtime parses file for code to be compiled ď˝ Generation of Page class (ASP.Net Page) ď˝ Instantiates server controls ď˝ Populates server controls ď˝ Rendering of Controls ď˝ Send the HTML to client browser ASP.Net Presentation14
- 15. Execution Process ď˝ Compiling the code ď˝ First time request ď˝ Code compiled to MSIL(Microsoft Intermediate Language) ď˝ Similar to Assembly Language ď˝ Used to achieve platform independency ď¨ Not the target what Microsoft wants ď˝ CPU independence ď˝ Efficient conversion to Native code ď˝ CLR(Common Language Runtime) compiles the code ď˝ A copy of Page is Cached ď˝ Used until changes are made to the page, and it needs to be compiled again ď˝ Updating the page causes a re-build ASP.Net Presentation15
- 16. Page Life Cycle Web Technologies16 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 15/10/2010 ASP.Net Presentation17 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 Stalljohannâ Courtesy: Patrick Stalljohannâ
- 18. ASP.Net Controls ď˝ HTML server controls ď˝ HTML elements programmable in server code. ď˝ HTML tags are left as is by compiler ď˝ Web server controls ď˝ Defined as Abstract controls ď˝ Have more built-in features than HTML controls e.g. Calendar, Menus etc. ď˝ Validation controls ď˝ Perform client side validation ď˝ Can be used to build own validators ď˝ User controls ď˝ Controls created by the User as ASP.Net webpages ď˝ Re-usability and Power to User. ASP.Net Presentation18
- 19. Global.asax ď˝ Declare application level Events and Objects ď˝ Code for events like ď˝ Application Start ď˝ Application End ď˝ Session Start ď˝ Session End ď˝ Since this code cannot be placed in application itself ď˝ Also used for Application and Session State Management ď˝ Compiled just like any other ASP.Net page ASP.Net Presentation19
- 20. Web.config ď˝ Stores configuration information in XML format ď˝ Optional ď˝ Allows for creating Name, Value pairs that could be accessed by the web application to apply configurations ď˝ Portable ASP.Net Presentation20
- 21. References ď˝ www.w3schools.com ď˝ www.codeproject.com ď˝ msdn.microsoft.com ď˝ CiL â Center for Innovative Learning Technologies, RWTH Aachen University 21 ASP.Net Presentation