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ASP

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ASP.NET
.
ASP.NET Environment
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ASP.NET is Microsoft's programming
framework that enables the development of
Web applications and services.
It is an easy and scalable way to build,
deploy, and run Web applications that can
target any browser or device.
ASP.NET pages work in all browsers -Navigator, Opera, AOL, Internet Explorer,
and others.
ASP.NET Environment
Many of the functionalites take place in
the background, their details hidden
from view of, and usually hidden from
concern by, the programmer.
 ASP.NET has a rich set of objects to
work with in an object-oriented and
compiled programming environment.
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ASP.NET Environment
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The programming environment supports
more than 25 .NET languages, including
built-in support for VB.NET, C#, and
JScript.NET.
.NET Framework offers over 4500 software
classes that encapsulate rich functionality
like XML, data access, file upload, regular
expressions, image generation, performance
monitoring and logging, transactions, SMTP
mail, and much more.
ASP.NET Environment
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These classes provide an extensive set of
objects, properties, and methods accessible
through Visual Basic for enhancing your Web
applications.
Though code is compiled, ASP.NET
automatically detects any code changes,
dynamically compiles the files if needed, and
stores the compiled results for reuse in
subsequent requests.
ASP.NET Environment
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Dynamic compilation ensures that
applications are up to date, and compiled
execution makes them fast. There is a short
delay when a page is first accessed and
compiled. Subsequent accesses, though,
retrieve the compiled, cached version of the
page for immediate execution.
ASP.NET Environment
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The ASP.NET framework is backward
compatible. It runs classic ASP pages just as
before, permitting integration of new
capabilities as they are learned. ASP.NET
pages have a new file extension, .aspx, to
differentiate them from standard ASP pages.
When this new extension is detected, the
ASP.NET processor handles the page
request.
ASP.NET Environment
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User interaction under ASP.NET, is through
a Web browser. New Web Form controls in
ASP.NET replace many of the standard
HTML tags.
ASP.NET Page Structure
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ASP.NET pages are transmitted to the Web
server in order to process data and generate
information. Normally, this request is triggered
by some user action on the local PC. For
instance, the user enters data into a form and
then clicks a button. The button click causes
the form to be transmitted to the server where
processing routines massage the data and
produce output. Output usually is embedded
on the Web page prior to its return to the user.
ASP.NET Page Structure
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Web page processing takes place on the
server. Data are collected on the local PC,
shipped to the server for processing, with
results returned to the local PC as a
reformulated or reformatted page displaying
processing results.
ASP.NET Page Structure
Web Application C#
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<%@ Page Title="Home Page" Language="C#"
MasterPageFile="~/Site.master" AutoEventWireup="true“
CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %>
<asp:Content ID="HeaderContent" runat="server"
ContentPlaceHolderID="HeadContent“> </asp:Content>
<asp:Content ID="BodyContent" runat="server"
ContentPlaceHolderID="MainContent">
<h2>
Welcome to ASP.NET! </h2>
<p> To learn more about ASP.NET visit <a href="http://www.asp.net"
title="ASP.NET Website">www.asp.net</a>. </p>
<p> You can also find <a
href=http://go.microsoft.com/fwlink/?LinkID=152368&amp;clcid=0x409
title="MSDN ASP.NET Docs">documentation on ASP.NET at MSDN</a>.
</p></asp:Content>
ASP.NET Page Structure
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The SCRIPT portion of the page, normally
coded at the top of the page, contains server
code to process data. That data can be
supplied by the user through a form, extracted
from files or databases, and/or generated
internally by the script. The script contains
processing commands, or statements which
are encapsulated within named subroutines,
or subprograms, that are called upon to
perform their processing.
ASP.NET Page Structure
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The HTML portion of the page serves two
functions. It captures input data for
transmission to the server, and it displays
output results from server processing.
These two functions take place through Web
Forms containing various server controls,
special form elements that permit data input,
output display, and requests for script
processing.
ASP.NET Page Structure
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Together, Web Forms and server scripts
encapsulate on a single page all the
functionality needed to turn Web pages into
full-featured information processors.
It is common for ASP.NET pages to supply
three types of HTML form controls to effect
information processing.
ASP.NET Page Structure
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A "data input control" is needed to supply
data for processing
A "script activation control" is needed to call
upon scripts to process the data
An "output control" is required to identify an
area on the page where script output can
appear.
ASP.NET Ex1.aspx
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<asp:TextBox id="MyInput"
runat="server"></asp:TextBox>
<asp:Button id="Button1"
onclick="Display_Output" runat="server"
Text="Click Me"/>
<asp:Label id="MyOutput" runat="server"/>
ASP.NET Ex1.aspx
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A textbox control accepts input data from the
user, a button calls a script to process the
data, and an output control provides the
target area for script output.
ASP.NET Ex1.aspx
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In this case the subprogram simply takes the
value entered into the TextBox and writes it,
along with other enclosing strings of text, to
the Label control.
Note that the script, the controls, and their
enclosing <form> tag contain the attribute
runat="server". This specification indicates
that all of these page elements participate in
script processing on the server.
ASP.NET Ex1.aspx
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In this example an <asp:TextBox> control
supplies the input box. An <asp:Button>
control calls a script subroutine named
Display_Output when clicked. An
<asp:Label> control serves as an area on
the page to which the script writes its output.
Both the TextBox and Label controls are
given id values so that the script can refer to
them when performing its processing.
ASP.NET Ex1.aspx
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<script runat="server">
protected void Display_Output(object sender,
EventArgs e)
{
MyOutput.Text = "Welcome, " +
MyInput.Text;
MyInput.Visible=false;
Button1.Visible=false; }</script>
ASP.NET Ex1.aspx
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The script appearing at the top of the page
contains the subroutine named
Display_Output. The associated list of
arguments contained within parentheses
(object sender, EventArgs e) are
references to the particular server control
which calls the subroutine -- the button in this
case.
ASP.NET Ex1.aspx
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“Object sender” parameter is a reference to
the source of the subroutine call -- the button
itself; the e (EventArgs) parameter is a
pointer to any data values associated with
the button -- none in this example. These are
standard arguments that must be supplied
when a button calls a subprogram.
ASP.NET Ex1.aspx
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The button click triggers a form submission
which transmits the controls and their values
to the Web server. At the same time, a URL
request is made of the server to retrieve a
new copy of this same Web page from its
storage directory on the server and to make
available to this page the transmitted values.
The button click also indicates that when the
page is retrieved the subprogram named
Display_Output is to be run.
ASP.NET Ex1.aspx
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This subprogram copies the transmitted data
from the Textbox into the Label area,
embedding it within the other text and HTML
on the page. Following script processing this
reformulated page is returned from the
server to your PC, with your name appearing
on the page.
ASP.NET Ex2.aspx
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Ex1.aspx can be changed to hide the textbox
and button after user clicks the button.
We will use “visible” property of the object
and set it to “false” in order to hide it.
“id” will be used as object name.
If “id” is “MyInput” then property can be set
as:
–
MyInput.visible=false
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