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Introduction to ASP .NET

Introduction to ASP .NET. Prehistory of ASP .NET. Original Internet – text based WWW – static graphical content  HTML (client-side) Need for interactive and animated content  Javascript (client-side) Need for database-driven web sites  CGI, ASP, JSP, PHP, ColdFusion (server-side).

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Introduction to ASP .NET

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  1. Introduction to ASP .NET

  2. Prehistory of ASP .NET • Original Internet – text based • WWW – static graphical content  HTML (client-side) • Need for interactive and animated content  Javascript (client-side) • Need for database-driven web sites  CGI, ASP, JSP, PHP, ColdFusion (server-side)

  3. About Processing on the Web • Hypertext Transfer Protocol (HTTP) • Request-Response Model • Statelessness of the web

  4. browser builds an HTTP request and sends it to the IP address indicated by the URL. Web server Web server on the destination host machine (identified by IP address) receives the request and, after any necessary processing, the requested file is returned. Safari

  5. Web Server • Running on Host • In Microsoft world this is Internet Information Server (IIS) • Linux  Apache • With ASP and .NET Framework, IIS can produce dynamic content (automatically-generated

  6. Technologies for Server Side Processing • CGI – Common Gateway Interface • Java Server Pages (JSP), Java Servlets • ActiveX Server Pages (ASP) • PHP Preprocessor (PHP) • ASP .NET Server-side processing enables 3-tier architectures

  7. Three-Tier Architectures Browser (with HTML/Javascript) • Three layers: • Client • Application server • Database server GUI interface (I/O processing) Web Server (with ASP .NET) Business rules Data storage DBMS • Thin Client • PC just for user interface and a little application processing. Limited or no data storage (sometimes no hard drive)

  8. Three-tier architecture Thinnest clients Business rules on separate server DBMS only on DB server

  9. Problems with Old ASP • Code mixing (HTML, Javascript, VBScript inline)  hard to understand and maintain • Interpreted  no compiled ahead of time, slows processing • ASP .NET allows for both code separation and pre-compiled processing • Same is true with PHP and JSP • Frameworks exist for both to enable code separation

  10. ASP .NET’s improvements over old ASP • More object-oriented and event-driven • robust class library • ability to create more efficient and reusable code • Multiple Language Support (VB, C#, C++, JScript.NET) • via Common Language Runtime • other languages can be added to the list • Powerful control objects (server controls, user controls) • “automatic HTML-generators” • Code Separation Support • can separate HTML code (display) from VB/C# code (server side processing) through use of server or user controls • use of code-behind files • Smart Code Output • automatic generation of browser/device compatible output • use of form validation controls • Deployment - easier administration of web sites • simplicity in installing components • Use of web.config file for configuration • and bin directory for Assemblies (DLLs)

  11. .NET Framework Terms • NET Framework – software framework that runs primarily on Microsoft Windows. • Framework – • Common Language Runtime (CLR) – run time environment that provides the underlying infrastructure for Microsoft's .NET framework (pp17-18) • Assembly – a .dll file (dynamic link library) that contains executable code compiled for the CLR (pp14-17)

  12. http://en.wikipedia.org/wiki/.NET_Framework These compilers generate managed code. Managed code is code that is run within the Common Language Infrastructure (CLI). Common Intermediate Language (CIL) is like Java’s bytecode Common Language Runtime (CLR) is like Java’s virtual machine Virtual Execution System (VES) is the “simulated CPU” upon which the CLR operates. Note: Visual C++ can compile into either managed or unmanaged code. Unmanaged code is compiled directly to the machine language of the CPU, and is not part of the CLR

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