Asp dot net final (1)
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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.
Asp dot net final (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. 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. Objectives Introduction to ASP.Net Basic Advantages Some Examples ASP.Net Presentation3
- 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. 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. 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. 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. 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. 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. 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. .Net - Framework ASP.Net Presentation11
- 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. Preserving Data Across Pages Session InProc StateServer SqlServer Cookies Query String Cookie Independent (Visual Studio 2010) ASP.Net Presentation13
- 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. 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. 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 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. ASP.Net Presentation18
- 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. 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. References www.w3schools.com www.codeproject.com msdn.microsoft.com CiL – Center for Innovative Learning Technologies, RWTH Aachen University 21 ASP.Net Presentation