Introduction to ASP.NET

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Outline

• Static vs. Dynamic Web Pages• .NET Framework• Installing ASP.NET• First ASP.NET Application

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Static Web Pages

• Traditionally web only provides static information • A Web page author composes an HTML page, and

saves it as an .htm or .html file• A user types a page request via URL into the browser,

and the request is sent from the browser to the Web server

• The Web server receives the page request and locates the .htm/.html page in local file system

• The Web server sends the HTML stream back across the Internet to the client browser

• The browser interprets the HTML and displays the page

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Processing a Request for an HTML Page

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Dynamic Web Pages

• Content does not exist before a page is requested

• Content, at least part of it, is generated upon request

• For example: – the current time on the Web server

– Online shopping basket

• Purpose: Transaction!

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Components for a Web-Based System

WebServer DB

DB

Web app

WebClient Web app

Web app

Web app

HTTPrequest

(cleartext or SSL)

HTTP reply(HTML,

Javascript, VBscript,

etc)

Plugins:•Perl•ASP.NET•JSP, etc

Database connection:•ADO,•ODBC, etc.

SQL Database

•Apache•IIS•Netscape etc…

Firewall

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CGI, ASP, and JSP

• CGI– Compiled– Difficult to modify and update– Consumes huge resources on the server

• ASP– Mix ASP script with HTML– Easy– ASP script itself needs to be interpreted every time it is

requested• JSP

– Server side scripting based on Java– Available in different platforms– Concepts very similar to ASP

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Java

• Java is simple

• Java is object-oriented

• Java is distributed

• Java is interpreted

• Java is robust

• Java is secure

• Java is architecture-neutral

• Java is portable

• Java is multithreaded

• Java is dynamic

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The .NET Framework

• ASP.NET is used to develop dynamic Web applications within the .NET Framework

• The .NET Framework consists of:

– A Common Language Runtime (CLR)

– A hierarchical set of Base Class Libraries (BCL)

• The .NET Framework is the architectural model for creating programs that interface with the operating system and the base class libraries

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The .NET Framework

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Web Services

• Web services encompass a set of related standards that can enable any two computer applications to communicate and exchange data via a network.

• Key Web services technologies– XML

– SOAP

– WSDL

– UDDI

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ASP.NET

• Overcome the major drawbacks of ASP• Supports VB and C#• Have a rich set of controls

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ASP.NET Installation

• Requirement for Operating Systems– Windows 2000/2003, or Windows XP Professional or Home

• Install the following– MDAC (Microsoft Data Access Components)

• Download MDAC 2.8 at www.microsoft.com/data (not SDK)• Filename: MDAC_TYP.EXE (5.4 MB)

– .NET Framework Redistributable version 1.1• Download at www.asp.net• Click Download link at the top right part of the window and

choose to download .NET• Filename: dotnetfx.exe (23.7 MB)

– Web Matrix • Download at www.asp.net • Filename: WebMatrix.msi (1.3 MB)

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ASP.NET Installation (Cont’d)Edit WebMatrix.exe.config file located at C:\Program files\Microsoft ASP.NET WebMatrix\v0.6.812\

 <?xml version="1.0" encoding="utf-8" ?><configuration> <configSections> <sectionGroup name="microsoft.matrix"> <section name="packages"

type="Microsoft.Matrix.Core.Packages.PackageListSectionHandler, Microsoft.Matrix"/> … </sectionGroup> </configSections> <startup> <supportedRuntime version="v1.1.4322" /> </startup>  <runtime> …

 

Insert this part

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First ASP.NET Program

<html>

<head><title>First ASP.NET Program</title></head>

<body>

<script language=“VB” runat="server">

Sub Page_Load()

Response.write ("This is my first line of ASP.NET _ program. <br>")

Response.write ("More to come next week. <br>")

End sub

</script>

</body></html>