ASP.NET - UTRGV Faculty Web

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Transcript ASP.NET - UTRGV Faculty Web 

ASP.NET
DR.JOHN ABRAHAM
PROFESSOR
UTPA
ACTIVE SERVER PAGES (ASP)
 Web application development environment
 Web applications use web browser to display
 Extensible hyperText Markup Language (XHTML)
 Client side scripting and server side scripting
What is ASP
 ASP.NET is a Microsoft Technology
 ASP stands for Active Server Pages
 ASP.NET is a program that runs inside IIS
 IIS (Internet Information Services) is Microsoft's Internet
server
 IIS comes as a free component with Windows servers
 IIS is also a part of Windows 2000 and XP Professional
Slide from w3schools
Multitier Application Architecture
 Web based applications are multi-tier as functionality is
divided into tiers, each tier may reside on different machines
(or all on the same machine)
 Data tier (bottom tier) – usually a RDBMS
 Middle tier (business logic) – ASP.NET (web Server)
 Top tier (user interface) – Browser
Web Forms
 Web applications written in ASP use special Web pages called
Web forms.
 Web form has .aspx file extension.
 The source code for a web form is stored in a related file
called code-behind file with file extension aspx.vb (this part
contains the program logic)
What is an ASP.NET file?
 An ASP.NET file is just the same as an HTML file
 An ASP.NET file can contain HTML, XML, and scripts
 Scripts in an ASP.NET file are executed on the server
 An ASP.NET file has the file extension ".aspx"
Slide from w3schools
ASPX file & VB file created by ASP
1. Creates an aspx file that contains XHTML code that contains
runat = “server”
Also code for creating controls are added.
2. Also creates VB code
 Partial Public Class _Default
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Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e
As System.EventArgs) Handles Me.Load
lblTime.Text = Now.ToString("hh:mm:ss")
End Sub
End Class
At run time
 When a browser requests an HTML file, the server returns
the file
 When a browser requests an ASP.NET file, IIS passes the
request to the ASP.NET engine on the server
 The ASP.NET engine reads the file, line by line, and executes
the scripts in the file
 Finally, the ASP.NET file is returned to the browser as plain
HTML
Some example code
 In class demo
Creating a web application
 From file choose new website, then asp.net website.
 Set location to file system and browse to where you want to
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create it.
Choose language and press OK
A web page named default.aspx is automatically created
Behind code also is created with the .vb extension
Right clicking will allow you to go to design mode
At the bottom of the page you can choose between design
and source code.
Coding
 Change the title of the page: In the source, change the title
from untitled to whatever you want.
 Now we will change the following body:
<body>
<form id="form1" runat="server">
<div>
</div>
</form>
</body>
Body Coding
<body>
<form id="form1" runat="server">
<div>
<h2> Current Time on the Web Server:</h2>
<p>
<asp:Label ID="lblTime" runat ="server" BackColor = "Blue"
EnableViewState="false"
font-size="XX-Large" ForeColor="Yellow"></asp:Label>
</p>
</div>
</form>
</body>