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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 Web Technologies3
- 4. Objectives Introduction to ASP.Net Basic Advantages Some Examples Web Technologies4
- 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. 1 Introduction5
- 6. WHY NOT CONTINUE WITH ASP??? Web Technologies6
- 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()” 1 Introduction7
- 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 1 Introduction8
- 9. THE RESPONSE – ASP.NET Web Technologies9
- 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 1 Introduction10
- 11. ASP.Net – Advantages Separation of Code from HTML Completely separate Presentation from Business Logic Examples 1 Introduction11
- 12. Simple Page with a GridView Web Technologies12
- 14. Code Behind File Web Technologies14
- 15. WHAT’S NEW THEN??? Web Technologies15
- 16. Simple Page with a GridView 2 Web Technologies16
- 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 1 Introduction19
- 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 1 Introduction20
- 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 1 Introduction21
- 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 1 Introduction22
- 23. .Net - Framework 1 Introduction23
- 24. Short Description of Framework 1 Introduction24
- 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 1 Introduction25
- 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 1 Introduction26
- 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 1 Introduction27
- 28. PAGE LIFE CYCLE 1 Introduction28
- 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.
- 36. CONTROLS
- 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.
- 42. POST BACK, VIEW STATE AND SESSION CONTROL
- 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 Web Technologies47
- 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 Web Technologies48
- 49. COMPARISON WITH PHP Web Technologies49
- 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 Web Technologies50
- 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 Web Technologies51
- 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 Web Technologies52
- 55. References www.w3schools.com www.codeproject.com msdn.microsoft.com 1 Introduction55