ASP.NET Best Practices - Useful Tips from the Trenches
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ASP.NET Best Practices - Useful Tips from the Trenches

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Slides from a presentation Habeeb Rushdan, MCT gave at the NoVa CodeCamp 2009.02 held at Microsoft Offices in Reston, VA on October 10, 2009. The session abstract follows: ...

Slides from a presentation Habeeb Rushdan, MCT gave at the NoVa CodeCamp 2009.02 held at Microsoft Offices in Reston, VA on October 10, 2009. The session abstract follows:

This session will focus on some key ASP.NET web development best practices that are commonly overlooked. We will dig into ASP.NET from an Object Oriented Programming perspective and explore how this enables us to create easily maintainable and scalable applications. If you have a Classic ASP or web scripting background and have recently transitioned to ASP.NET or have been thinking about making the transition to ASP.NET, this session will get you started on the right path. Also, if you have been developing in ASP.NET for a while and are looking for some useful tips, be sure to stop by as well. I will pull from my years of experience as a software development consultant and MCT working with numerous development teams to help promote code that works as expected and is easily maintainable. This session will be geared towards ASP.NET WebForm development. Sorry ASP.NET MVC, due to presentation time limitations you couldn’t be included in the roster this time around.

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    ASP.NET Best Practices - Useful Tips from the Trenches ASP.NET Best Practices - Useful Tips from the Trenches Presentation Transcript

    • ASP.NET Best Practices - Useful Tips from the Trenches
      HabeebRushdan, MCT
      hrushdan@lowerhead.com
      LowerHead Consulting, LLC
    • Target Audience (Why should I sit through this session anyway?)
      Programmers new to .NET Development
      Any non-programmer(even those IT gals & guys) interesting in learning about ASP.NET Development
      Existing ASP.NET web developers interesting in learning a few best practices… we only have a little over an hour so we can’t cover too much!
    • Agenda
      Introductions
      Brief Introduction of ASP.NET
      Best Practice Examples
      More Best Practice Examples
      A bit More Best Practice Examples…
      Useful Websites & Articles
      Conclusion
    • About your Presenter
      10 + Years working Professionally in the Technology Field
      Microsoft Certified Trainer (MCT)
      Microsoft Certified Professional Developer (MCPD: Web Developer)
      Microsoft Certified Technology Specialist (MCTS: .NET Framework 3.5, ASP.NET Applications)
      Microsoft Certified Technology Specialist (MCTS: .NET Framework 2.0: Web Applications)
      Microsoft Certified Application Developer (MCAD.NET)
      Adobe Certified Instructor - Flash
      Adobe Certified Expert (ACE - Flash CS3 Professional)
      Macromedia Certified Flash MX Developer
    • A little bit about you…
      Who are you?
      I really want to know…
      (Sorry CSI, I couldn’t resist!)
    • What is ASP.NET???
      A series of Classes that live in the System.Web Assembly
      Provides the ability to easily create dynamic websites and applications in the .NET Framework
      Has all the benefits of OOP and the ability to access the thousands of classes built-in to Microsoft’s .NET Framework Class Library
    • Demo Time – Using Object Browser to look into System.Web Assembly’s Types
    • ASP.NET Page Execution Life-Cycle
      A series of ASP.NET Page Events that occur in a specific order
      Occurs every time you make a Request to an ASP.NET Page
      Whether it is the first time you visit a page or any additional PostBack to the same page!
    • ASP.NET Page Life-Cycle Events
      PreInit
      Init
      InitComplete
      PreLoad
      Load
      Control events
      e.g Button1_Click, UserNameTextBox_TextChanged
      LoadComplete
      PreRender
      SaveStateComplete
      Render
      Unload
    • Some of most commonly used ASP.NET Page Life-Cycle Events
      PreInit
      Set a Master page or Theme dynamically
      Load
      Set properties in controls and grab data to be bound to controls that allow Data-binding
      PreRender
      Make final changes to the contents of the page or its controls e.g. attaching custom HTML attributes to a Button
    • Demo Time – Handling Page Events
    • Tips for Creating WebSites
      Start with a Blank Solution
      Separate out your Application into logical Tiers
      Separate Projects for UI, Business Rules, Data-Access, etc
      Create a BasePage that other pages will inherit from
      Use MasterPages for consistent layout
      Use UserControls for reusable UI functionality
    • Demo Time – Creating a WebSite
    • State Management Options in ASP.NET
      ViewState
      Session
      Application
      Cache
    • ViewState
      Maintains state at the Page/Control level
      Is stored in a Hidden Form Input Element on the Client
      It can get very large, very quickly so beware and disable it where possible
    • ASP.NET Control Tips
      Don’t use a <ASP:Label> Server-side Tag when a caption will not be changed programmatically. Instead, a good Ole’ <Span> Client-side Tag will suffice
      Disable ViewState in controls that don’t need to maintain their state during PostBacks
    • Demo Time - ViewState
    • Session
      Maintains state at the Session level (generally speaking, per a user’s browser instance)
      Items are accessible from Page to Page
      Keep in mind that Items stored In Session “linger” until they Expire
      Don’t overuse or your web server’s memory will complain!
      Make sure any custom types you define that need to be stored in Session are marked “Serializable”
    • Cache
      Robust Application-wide and Non-Session specific state management object
      Provides many options for Item Expiration and Dependencies
    • Cache & Application Suggestions
      Use the Cache Object instead of the legacy Application Object
      Cache provides tons of more options for intelligently managing your application-wide state data
      Compare the options available with Application.Add to the Cache.Add & Cache.Insert
    • State Management NO NOs
      Don’t store unmanaged objects in State Management
      For example:
      No DataReaders
      No File Handles (however, the contents of a file stored as System.String is OK)
    • State Management Suggestions
      Always check for the existence of an object before accessing it (also called defensive programming)
      Use string constants for keys
      This prevents misspellings and other nasty side-effects
      Consider using a “Manager” pattern with State Management objects
    • Demo Time – SessionManager Class
    • Some General Tips
      Dispose of unmanaged resources after their use
      This is especially important in web applications because of their disconnected nature
      Therefore, indulge the “using” statement
      Make sure you have a robust exception handling strategy
      Use Try/Catch/Finally where potential issues may occur and have a consistent logical way of dealing with exceptions
    • Exception Handling in ASP.NET
      Web.config page redirect option
      Page_Error
      Application_Error
    • ASP.NET AJAX Options
      Server-side AJAX
      Using UpdatePanels with existing ASP.NET controls to “trick” the client that PostBacks are not occurring
      Client-side AJAX
      No trickery involved but more work & better bang for the buck
    • AJAX Tips
      Minimize the use of Server-side AJAX and Update Panels
      Bad for performance and may cause some unexpected results
      Embrace Client-side AJAX (true AJAX)
      Microsoft makes it easy but you will need to learn some JavaScript
      Don’t be scared… JavaScript is fun and exceptionally versatile!
    • Demo Time – Client side AJAX
    • Any Tips you would like to Add?
      Come on, don’t be shy…
      We won’t bite ya… we just had some free pizza!
    • What have you learned?
      An Overview of ASP.NET
      Several ASP.NET Best Practices
    • Useful Websites & Articles
      Microsoft’s Official Developer Network Site
      http://www.msdn.com
      ASP.NET Official Web Site
      http://www.asp.net/
      http://www.asp.net/ajax/
      CodeProject Web Site
      http://www.codeproject.com/
    • Conclusion
      Questions?/Comments…
      As always, “Live long and code proper!”