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Web/Database Connectivity with ASP.NET

Web/Database Connectivity with ASP.NET. David Henson. dhenson@certifiednetworks.com. Class Logistics. • Class Hours • Classroom Setup • Class Format. • https://www.certifiednetworks.com. Course Outline. Module 1 - Web Overview Module 2 - ASP.NET Overview Module 3 - ASP.NET Webform

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Web/Database Connectivity with ASP.NET

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  1. Web/Database Connectivity with ASP.NET David Henson dhenson@certifiednetworks.com

  2. Class Logistics • Class Hours • Classroom Setup • Class Format • https://www.certifiednetworks.com

  3. Course Outline Module 1 - Web Overview Module 2 - ASP.NET Overview Module 3 - ASP.NET Webform Module 4 – Debugging/Tracing Module 5 - .NET Controls Module 6 – ADO.NET

  4. Course Outline, Contd. Module 7 – Advanced Data Topics Module 8 - Security Module 9 – ASP.NET Email/File Integration Module 10 - XML

  5. Module 1 – Web Services Overview

  6. Definitions • ASP • ASP.NET • HTTP • IIS • Virtual Directory • Browser

  7. Web Server/Client Interaction

  8. HTTP Protocol • Header • Body

  9. Lab 1A – Viewing HTTP Traffic • Things to look for: – Header – Body – Server Response Code

  10. Methods For Dynamic Server- Based Content • CGI – Opens separate executable • ASP – Interpreted each page load, Windows Only • JSP – Portable, fast familiar to Java Programmers • PHP – Cross Platform, C & Perl Like • ASP.NET – Compiled, integrated into framework

  11. HTML Protocol • End result of any dynamic server side product- dictates rendering of page • Tags: <html> <body> <table><tr><td> <form> <a href=“…”> <br> <input type=“…”>

  12. Lab 01B – Creating an E- Commerce Website Framework

  13. Module 2 – ASP.NET Overview

  14. .NET Framework Web Services User Interface ADO.NET: Data & XML Base Class Library Common Language Runtime

  15. What is ASP.NET • Not a programming language but a delivery mechanism • Can leverage any .NET programming language, like built-in VB.NET, C#, and third party like Delphi

  16. .NET Features • Multiple Language Support • Increased Performance – Compiled code – Cache • Server Controls • Web Services • Improved Security • Greater Scalability • Cookie-less Sessions • Easy Configuration and Deployment

  17. Classic ASP Programming Model • Procedural, Top to Bottom Approach • HTML/ASP Code Mixed

  18. Classic ASP Example

  19. Classic Windows Programming Model • Create a Form • Drop Controls On Form • Write Event Handlers • User activity generates messages which are handled by the event handlers

  20. Demonstration – Spy++ • What to look for: – Event Driven Model of Windows

  21. ASP.NET Programming Model • Process Same as Windows Programming • Connectivity/State is emulated

  22. ASP.NET Example

  23. ASP.NET Configuration Files • Web.con • <%@page ... %> tag

  24. Demonstration – Visual Studio .NET Quick Tour

  25. Module 3 – ASP.NET Webforms

  26. Webforms Defined • aspx extension • @Page Directive <%@ Page Language="vb" %> • Framework Is an Object Model • Denoted by the runat="server" Attribute <Form runat="server"> </Form> • Contain Client-side and Server-side Code • Contain HTML and Server Controls

  27. Events • User requests dbdemo.aspx • Page_Load event detected • Sub Page_Load() executed • All event handlers are called in a single flow of motion, before the user ever gets to see the page.

  28. WebForm Main Events • Events Occur Each Time the Page is Accessed • Page_Init • Page_Load • Controls(only when form is posted back…Button1_Click for example) • Page_Unload

  29. Other Supported Webform Events • Error – whenever the page generates one • CommitTransaction • AbortTransaction

  30. Defining Server Control Event Handlers <asp:button id=“Button1” onclick=“MyHandler”/>

  31. Webform Validation • Page.IsValid will be false if any control has failed validation • Asp:ValidationSummary Control • Set Display property of any validation control to None • ValidationSummary Control will display msg from all controls • Client Side Validation Setting: Set BaseValidator.EnableClientSideScript for any contol

  32. Manual Validation • Add form submit button with CausesValidation set to False, then call Page.Validate yourself. • Take action based upon page.IsValid property

  33. Lab 03A – Working with Web Forms

  34. Module 4 – Debugging/Tracing • Debugging • Tracing • Error/Exception Handling

  35. To Compile in Debug Mode • 1. Add a "Debug=true" directive at the top of the file that generated the error. Example: <%@ Page Language="C#" Debug="true" %> or: 2) Add the following section to the configuration file of your application: <configuration> <system.web> <compilation debug="true"/> </system.web> </configuration>

  36. Using the Debugger • Setting Breakpoints • Debug shortcut keys:

  37. Logging Exceptions Try …some code Catch err AS Exception Dim log as New EventLog() Log.Source = “MyPage” Log.WriteEntry(err.Message, EventLogEntryType.Error) End Try

  38. Viewing Eventlogs

  39. Display of Errors • Error Modes: – RemoteOnly – Default, hides details if not local client – Off – Shows all details and source…good for development, not production – On – Displays custom error page if any, or generic error message

  40. Custom Error Pages <configuration> <system.web> <customerErrors defaultRedirect=“MyError.aspx”> <error statusCode=“404” redirect=“My404.aspx”> </customErrors> </system.web> </configuration> Only works if ASP.NET is handling the request(.aspx extension)

  41. Lab 04A – Debugging/Tracing • Enabling Tracing • Exception Handling • Debugging • Writing to the Windows Eventlog • Custom Error Messages

  42. Module 5 – .NET Controls

  43. The ASP.NET Server Controls • HTML Server Controls • ASP.NET Web Form Controls • ASP.NET List Controls • ASP.NET Templated Controls • ASP.NET Rich Controls • ASP.NET Validation Controls • ASP.NET Mobile Controls

  44. User Controls

  45. Custom Server Controls

  46. Key Concept - Rendering • Controls are responsible for rendering themselves • You can override the Render() function on your own controls

  47. HTML Controls • Best for “Converting” from ASP to ASP.NET • Add the runat=“server” attribute to existing controls

  48. ASP.NET Controls • Mirror HTML Controls • More Consistent Properties/Naming Across Control Types

  49. Common ASP.NET Webform Control Properties • ID • Text

  50. Control Validation

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