Build Web Applications with Visual Studio

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Build Web Applications with Visual Studio .NET

• Carlotta Eaton www.nr.vccs.edu/eaton
• Associate Professor of IST
• New River Community College
• Slides by Microsoft
• Modified by Carlotta Eaton

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Agenda

• Web Forms
• ASP.NET Applications
• Caching

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Session Prerequisites

• Experience with Visual Basic 6.0, Visual Basic
  .NET, Visual C or Visual C, Visual Basic
  Scripting Edition
• Experience developing Web Applications

Level 200
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Agenda

• Web Forms
• ASP.NET Applications
• Caching

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Web FormsActive Server Pages .NET

• Part of the .NET Framework
• ASP.NET builds, deploys, and runs Web
  applications and services
• Visual Studio .NET Web applications support
  ASP.NET directly

VB
C
C
Perl
Python

Web Services
User Interface
ASP.NET
ADO.NET Data and XML
Base Framework
Common Language Runtime
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Web Forms ASP.NET Page Framework

• New control-based, event-driven execution model
  for Web UI
• Visual Basic for the Web
• Much less code required than ASP
• Cleanly encapsulated functionality
• Executed via CLR as native code
• Visual Basic, C, JScript
• ASP.NET pages use .ASPX extension
• Runs side-by-side on Internet Information Server
  with current ASP applications

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Web Forms Part Declarative, Part Code

• A Web Form combines declarative tags (HTML, ASP
  directives, server controls and static text) with
  code
• However, good separation provided between code
  and tags

Visual Studio .NET
single file
separate files
lttagsgt
lttagsgt
code
code
Form1.aspx
Form1.aspx
Form1.vb
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Web Forms Page Event Life Cycle
Page is loaded and initialized
Page_Load
Control Events
Textbox1_Changed
1. Change Events
Button1_Click
2. Action Events
Page_Unload
Page is disposed
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Web FormsServer Controls

• 45 Built In Controls
• Target any HTML 3.2 browser
• Raise Events to Server
• Basic Controls
• textbox, checkbox, radio, button
• Advanced Controls
• AdRotator, Calendar, DataGrid, Validator

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Web Forms Server Controls

• Declared as HTML or XML tag with runatserver
  attribute
• Examplesltinput typetext idtext2
  runatservergt
• ltaspcalendar idmyCal runatserver/gt
• Tag name identifies control to create
• Control is implemented as .NET object
• ID attribute provides programmatic accessor

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Web FormsBasic Server Controls

• ltasptextbox idtext1 runatserver/gttext1.text
  Hello World
• ltaspcheckbox idcheck1 runatserver/gtcheck1.chec
  kedTrue
• ltaspbutton idbutton1 runatserver/gtonclickbutt
  on1_onClick()
• ltaspDropDownList idDropDownList1
  runatservergtDropDownList1.SelectedItem.Text
  Hello

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Web FormsServer Side Events

• ltaspbutton idButton1 runatserver
• onClickButton1_Clickgt
• ltaspDropDownList idDrpDwn1 runatserver
  OnSelectedIndexChangedDrpDwn1_ItemSelectedgt

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Agenda

• Web Forms
• ASP.NET Applications
• Caching

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ASP.NET ApplicationsSaving Application State

• Essentially global variables for the application
• Application(CompanyName)
• Can lock or unlock Application State Variables
• Application.lock
• Application(GlobalCounter) NewValue
• Application.unlock

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ASP.NET ApplicationsSaving Session State

• Per User Variables
• Available to All Pages in the Site
• Session(UserID) 5
• UserID Session(UserID)

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ASP.NET ApplicationsASP versus ASP.NET State

• ASP Session State
• Forces Server Affinity
• Dependent on cookies
• Not fault tolerant
• ASP.NET Session State
• Support for Web Gardens and Server Farms
• Doesnt require cookies
• Better fault tolerance

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ASP.NET ApplicationsConfiguring Session State

• Configuration information stored in Web.Config
• ltsessionState
• modesqlserver
• cookielessfalse
• timeout20
• sqlConnectionStringdata source127.0.0.1user
  idsapassword
• stateConnectionString"tcpip127.0.0.142424" /gt
• lt/sessionStategt

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ASP.NET ApplicationsConfiguring Session State

• Mode
• InProc Conventional session variables. Stored
  in-memory on the web server
• StateServer Sessions are stored on an external
  server, in memory
• SqlServer Sessions are stored in a SQL database
• Cookieless
• Determines if Cookieless sessions should be used
• Values are true or false
• TimeOut
• Determines the default timeout for the web site

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ASP.NET ApplicationsConfiguring Session State

• sqlConnectionString
• contains the datasource, userid, and password
  parameters necessary to connect to a sql database
  that holds the session state
• connectionString
• Contains information needed to connect to the
  state server

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ASP.NET ApplicationsStoring Data in SQL Server

• In order to setup the SQL Server to store state
  information you must run a small T-SQL script on
  the target server
• InstallSQLState.sql can be found in
  sysdrive\winnt\Microsoft.NET\Framework\version
  
• Creates the following on the server
• A database called ASPState
• Stored Procedures
• Tables in TempDB to hold session data.
• Uninstall is via
• UninstallSQLState.sql

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Agenda

• Web Forms
• ASP.NET Applications
• Caching

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CachingPage Output Caching

• Pages That Dont Change Frequently
• Dramatic Performance Increase
• lt_at_ OutputCache Duration "500
  VaryByParamnone gt

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Caching Fragment Caching

• Dynamic Portions of a Page
• Data Doesnt Change Frequently
• User Control

Site Header
lt_at_ OutputCache Duration60 VaryByParmnone gt
Navigation
Page Body
Caches only the page body for the specified
duration
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Caching Cache APIs

• Programmatically Cache Data
• Cache.Insert( _
• Key, _
• Value, _
• CacheDependency, _
• AbsoluteExpiration, _
• SlidingExpiration, _
• Priority, _
• PriorityDecay, _
• Callback)

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Caching Cache APIs

• Key
• String used to look up the cached item
• Value
• Item or object to store in the cache
• CacheDependency
• Cache item can automatically expire when a file,
  directory, or other cache item changes

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Caching Cache APIs

• AbsoluteExpiration
• Cache item can expire at some fixed time
  (midnight, for example)
• SlidingExpiration
• Cache item can expire after a certain amount of
  inactivity
• Priority
• When forcing items from the cache, which items
  should go first
• PriorityDecay
• Within a given priority range, does this item
  expire fast or slow

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Session Summary

• Visual Studio .NET ASP.NET Visual Basic for
  the Web
• Drag-drop-double-click
• Event-driven, control-based encapsulation
• Target any client, or specific clients
• Big runtime benefits over ASP
• Fast native code execution
• Hassle-free deployment
• Baked-in support for security, Web Farms,
  out-of-proc Session state, etc.

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For More Information

• MSDN Web site at
• msdn.microsoft.com
• Microsoft Official Curricula (MOC)
• Introduction to ASP.NET
• Course 2063
• Programming the .NET Framework with Visual Basic
• Course 2415
• Microsoft Press
• Introducing Microsoft .NET

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MSDNEssential Resources for Developers
Subscription Services
Library, Professional, Universal Delivered via
CD-ROM, DVD, Web
OnlineInformation
MSDN Online, MSDN Flash
Training Events
MSDN Training, Tech-Ed, PDC, Developer Days,
MSDN/Onsite Events
Print Publications
MSDN Magazine MSDN News
MembershipPrograms
MSDN User Groups
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Web Forms Demonstration 1
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Questions And Answers
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