ASP.NET

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ASP.NET

• .NET Environment

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Overview

• Part of Microsofts .NET environment
• Used for Development of
• Websites
• Internet applications
• Web Services XML Web Services
• Languages
• VB.NET, C, J
• Successor of ASP pages (but very different)
• Event driven rather than script driven

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.NET environment
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.NET environment

• Common Language Runtime (CLR)
• Basis for the .NET environment
• Code is compiled to .dll files
• A solution can contain code of multiple languages
• Versions
• Visual Studio (.Net Framework 1.0)
• Visual Studio 2003 (.Net Framework 1.1)
• Visual Studio 2005 (.Net Framework 2.0)
• .Net Framework 3.0
• Visual Studio Orcas (.Net Framework 3.5)

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HISTORY Changes

• Visual Studio .NET (2002) - .Net Framework 1.0
• Visual Studio 2003 (2003) - .Net Framework 1.1
• Visual Studio 2005 (2005) - .Net Framework
  2.0/3.0
• Many new features
• New Data Controls (GridView, FormView,
  DetailsView)
• Navigation Controls
• Master Pages
• Login controls
• Themes
• Skins
• Allows full pre-compilation
• Visual Studio 2008 - .Net Framework 3.5
• Ajax integration
• Nested master pages
• Additional data controls
• Free versions are available on http//www.microsof
  t.com/express/product/default.aspx

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ASP.NET
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ASP.NET Components

• Interface pages
• Code Behind Pages
• Master Pages (only .NET 2.0 and higher)
• User Controls
• Sitemap
• Style Sheets
• Additional Components for .Net 3.0
• Windows Presentation Foundation - advanced
  graphics
• Windows Communication Foundation allows
  programs to act more like web services using a
  service-oriented messaging system
• Windows Workflow Foundation
• Windows CardSpace
• AJAX

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Lets take a look at an example
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Advantages

• Faster than script-based languages since it is
  converted into precompiled dlls
• Easier error handling (caught before run-time,
  allows try-catch blocks)
• Can use existing controls and templates provided
• An extensive set of controls and class libraries
  allows the rapid building of applications.
• The Code-behind the interfaces can be coded in
  the language of preference
• Ability to cache the whole page or just parts of
  it to improve performance.
• Ability to separate the looks of the page and the
  code-behind.
• The CLR will take care of garbage collection, and
  other basic functions
• http//en.wikipedia.org/wiki/ASP.NET

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Disadvantages

• Platform limitations
• E.g. .Net framework 2.0 has the following system
  requirements Supported Operating Systems
  Windows 2000 Service Pack 3 Windows 98 Windows
  98 Second Edition Windows ME Windows Server
  2003 Windows XP Service Pack 2
• High memory usage and it can be slow at execution
  
• Some backward and forward incompatibilities exist
• Reverse-Engineering is possible
• Code can be decompiled and can be put live with
  the actual code
• Relatively new

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Comparing .NET to Other Approaches

• Much debate
• Many different opinions usually due to different
  backgrounds

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http//www.promoteware.com/Module/Article/ArticleV
iew.aspx?id10
http//www.oracle.com/technology/pub/articles/hull
_asp.html
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J2EE vs. Microsoft.NET - A comparison of building
XML-based web services By Chad Vawter and Ed
Roman June 2001 Prepared for Sun Microsystems,
Inc.

• .NET has a simpler programming model, enabling
  rank-and-file developers to be productive without
  shooting themselves in the foot
• .NET gives you language neutrality when
  developing new eBusiness applications, whereas
  J2EE makes you treat other languages as separate
  applications
• .NET benefits from being strongly interweaved
  with the underlying operating system

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Conclusion

• Dependswhat you want to accomplish and what is
  the programmers background
• There are many tools existent to combine the
  different approaches

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AJAX (Asynchronous JavaScript and Xml)

• Framework that can be used with web applications
  (build-in in .netframework 3.5)
• Increases responsiveness by only refreshing parts
  of a webpage
• http//www.asp.net/ajax/
• Concerns
• Due to the nature of ajax, some of the analytics
  services, back buttons or search engine
  optimizations may not work as expected

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Dot Net Nuke

• Free Tool
• Used to set up WebPages with some commonly used
  elements
• Based on the .NET environment
• demo.dotnetnuke.com/dnndemo

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Questions???