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ASP.NET 2.0 Tips & Tricks Tips & Tricks for ASP.NET 2.0

ASP.NET 2.0 Tips & Tricks Tips & Tricks for ASP.NET 2.0. Rob Howard Telligent Microsoft Regional Director. For more information…. Rob Howard Email: rhoward@telligent.com Website: telligent.com Blog: weblogs.asp.net/rhoward Telligent Community Server (communityserver.org)

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ASP.NET 2.0 Tips & Tricks Tips & Tricks for ASP.NET 2.0

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  1. ASP.NET 2.0 Tips & TricksTips & Tricks for ASP.NET 2.0 Rob Howard Telligent Microsoft Regional Director

  2. For more information… • Rob Howard • Email: rhoward@telligent.com • Website: telligent.com • Blog: weblogs.asp.net/rhoward • Telligent • Community Server (communityserver.org) • Custom Application Development (ASP.NET)

  3. Agenda • Cross Page Posting • Validation Groups • Wizard Control and Profile Registration • Secure Connection String Storage • Config-based Control Registration • Caching Features • Client Script Goodies, Client Callbacks • XML Databinding to build a Blog Reader • URL Rewriting • Site Map

  4. 1. Cross Page Posting • Problem • Postback model isn’t always desired • Scenario: Search or lookup button at top of page • New “PostBackUrl” property • <asp:button PostBackUrl=“b.aspx” runat=“server”/> • Declaratively or programmatically set • Page posted to has strongly typed access • Access controls via “Page.PreviousPage” property • <%@ PreviousPage VirtualPath=“a.aspx” %>

  5. Cross Page Posting

  6. 2. Validation Groups • Problem • Today validation controls apply “all or nothing” • ASP.NET 2.0 “ValidationGroup” property • Supported by all Validation and Postback controls • Controls in ValidationGroup validate with postback • Programmatic Support for Validating Groups • If (Page.Validate(“group_name”)) Then • Page.IsValid evaluates ValidationGroup Postback

  7. Validation Groups

  8. 3. Wizard Control • Problem • Difficult to build Wizard style UI today • Enables linear and non-linear navigation • Developer defines templated “steps” within control • Control state maintained throughout wizard steps • Flexible Wizard Control Navigation Model • MoveTo(wizardStep), ActiveStepIndex, etc • Events can fire on steps and completion

  9. Wizard Control

  10. 4. Connection String Storage • Persistence and declarative referencing • Stored in *.config • Avoid hard-coding within pages/code • Can be optionally encrypted • Built-in design time support • Promote use for best practices • Enable optional encrypting of values in config • Admin Support • MMC Admin Tool Support • Configuration API Support

  11. Config Connection Strings Web.config: <connectionStrings> <add name="pubs“ ProviderName=“…” connectionString=“…” /> </connectionStrings> Page.aspx: <asp:SqlDataSource Id=“MySource” ConnectionString=“<%$ connectionStrings:pubs %>” SelectCommand=“select au_id from authors” runat=“server”/> Code.vb: Dim connstr As String = ConfigurationSettings.ConnectionStrings(“pubs”)

  12. Connection Strings

  13. 5. Web.Config Registration of Controls • Server controls can now be registered within web.config files instead of on every page • Full Visual Studio support w/ intellisense <!-- Web.Config --> <controls> <add tagPrefix="acme" tagName="uc" src="controls/uc.ascx" /> <add tagPrefix="my" namespace="MyControls.Basic" assembly="MyControls" /> </controls>

  14. Control Registration

  15. 6. Caching • SQL 7 & 2000 Support • Table change dependencies on SQL 7 & 2000 • Requires <caching> configuration settings • One-time setup of SQL Server database • Polling model • SQL Server “Yukon” • Result Set dependencies for SQL Yukon • Supported through ADO.NET SqlCommand • No setup required • Notification model

  16. SQL Server 7 & 2000 • Table level notifications only • Notification when data in table changes • Row-level notification is not supported • Requires one time setup of SQL 7 / 2000 • Triggers on tables that participate • Stored procedures called to check • Of Note: • Entries in cache table < # of tables in DB • Entries in cache = # items in cache table

  17. Data Caching

  18. Page z trigger products 1 How it works: SQL 7 & 2000 ASP.NET SQL Server Cache Northwind Database Products table SqlCacheDependency DataSet ChangeNotification table 3 aspnet_regsql.exe

  19. 7. Client Script Goodies • Client-side click event handlers on controls: • Focus mechanisms: • Page.SetFocus(control) • TextBox.Focus() • Default button and focus • <form DefaultFocus=“control1” runat=“server”> • <form DefaultButton=“button1” runat=“server”> <asp:button Text=“Push Me!” OnClick=“Button1_Click” OnClientClick=“ClientButton1_Click” runat=“server” />

  20. Client Script Goodies • Validation Error Focus • “SetFocusOnError” property • Auto-scroll maintenance on postback • Ideal for large pages – no code required • Simplified Client Script Registration • Page.ClientScript helper methods • Client-side Event Callbacks • ICallBackEventHandler interface • Used by TreeView, GridView controls

  21. Client Script Goodies

  22. 8. XML Databinding • <asp:XmlDataSource> control enables data source binding against XML files • Optional XPath expression to scope results • <asp:DataList> supports binding against <asp:XMLDataSource> • Use “XPath(expression)” statement in templates • “XPathSelect(expression)” selects a node list • Combine two to build simple RSS Reader

  23. RSS Reader

  24. 9. URL Rewriting • Enable vanity URLs • Eliminate ugly query string URLs • Simplifies customer navigation experience • Possible in ASP.NET 1.1 • Required custom code • Ex., Community Server • ASP.NET 2.0 • Simply edit configuration file • Add/Remove/Clear mappings

  25. URL Rewriting

  26. 10. Site Map • How to manage all the site urls • Many navigation points • What is the relationship between these points • Possible in ASP.NET 1.1 • Write a complete site map • Ex., Community Server • ASP.NET 2.0 • Site Map is a built in feature (Provider based) • Makes adding URLs/Pages unbelievably easy

  27. Site Map

  28. Summary • Enormous number of new features in ASP.NET 2.0 • Tons of additional cool features out there… • Visit http://beta.asp.net/quickstarts to try out hundreds of samples online • Download these slides+demos from: http://www.rob-howard.net

  29. 10. Dynamic Master Pages • Master pages encapsulate layout • Enforce a consistent look and feel across pages • Master pages can be dynamically chosen • Scenario: Per browser type or per customer type • Two mechanisms to set dynamically change master: 1) Set Page.MasterPageFile property in Page_PreInit event 2) Device Filter: <%@ page ie:masterpagefile=“ie.master” %>

  30. Dynamic MasterPages

  31. 10 Localization • Whidbey supports nice localization model • Store strings and values in a separate .resx file • Culture and language settings • programmatically and declaratively set • Override InitalizeCulture on the Page class • <%@ Page UIculture=“value” %> • Cool Tip: You can set value to “auto” to have it automatically based on the client browser’s user agent string

  32. Localization

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