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ASP.Net

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ASP.Net is a subset of .Net that contains tools for developing web based applications ... as IIS (Internet Information Server) or Apache makes web pages available to a ... – PowerPoint PPT presentation

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Title: ASP.Net


1
ASP.Net
2
ASP and .Net
  • .Net is a collection of libraries, templates and
    services designed to make programming
    applications of all kinds, easier, more flexible
    (multi platform), and more scalable
  • ASP.Net is a subset of .Net that contains tools
    for developing web based applications

3
Client/Server Overview
  • A server is a program that makes services
    available to another program (a client)
  • For instance, A web server such as IIS (Internet
    Information Server) or Apache makes web pages
    available to a client application such as a
    browser
  • A database server makes data available to client
    that makes a valid request

4
Client/Server Overview Cont.
  • ASP.Net pages are served from IIS when a browser
    requests an .apsx page.
  • IIS passes the request to .Net which processes
    the C or VB code and ASP controls, makes any
    database requests and renders them into xhtml
  • IIS then sends the rendered page to the browser
    that made the request

5
ASP.Net Server/Client
6
elements of an ASP Page
  • The Page
  • Web Form
  • Html and ASP.Net Controls
  • Code behind
  • CSS

7
The Page
  • The page is the container for everything else
  • An ASP application can contain several pages
  • Usually the starting page is called
    Default.aspx
  • Every page begins with a directive
  • lt_at_ Page Language"C" AutoEventWireup"true"
    CodeFile"Default.aspx.cs" Inherits"_Default" gt
  • This directive tells IIS that the page is an
    ASP.Net application

8
The web form
  • An ASP. Page can have only 1 form.
  • A key attribute of the form is runatserver
    which tells IIS to send it to .Net for compiling
    and rendering. (Plain html elements are just
    passed through to the client without any .net
    processing)
  • All asp controls must be contained within the form

9
HTML and ASP Controls
  • An ASP.Net page can use
  • plain xhtml
  • Xhtml controls (xhtml with the runatserver
    attribute added)
  • ASP.Net controls, controls provided by .Net
    Library
  • Client side JavaScript

10
Design and Source views
  • ASP.net pages have two views Design and Source
  • Design view shows controls approximately as they
    will appear on the rendered page (some info shown
    here wont be displayed)
  • Source view shows the html and the asp.net
    controls.
  • ASP controls are represented as XML fragments
  • Controls can be added in Design or source views

11
XML Fragment of an ASP Control
  • ltaspLabel ID"Label1" runat"server" Text"Enter
    the Miles"gtlt/aspLabelgt

12
Code Behind
  • ASP.Net allows you to write the code in a
    separate file.
  • This makes code easier to read and maintain
  • The page directive tells .Net where to find the
    code page.
  • Code can still be placed directly in the web page
    if you wish either between ltscriptgt tags or
    between lt gt brackets

13
CSS
  • ASP.Net supports CSS and has a good CSS editor
  • CSS classes and styles can be added to a ASP
    control by using the CssClass attribute
  • ltaspTextBox ID"txtMiles" runat"server"
    CssClass"entry"gtlt/aspTextBoxgt

14
ASP Pages and State
  • ASP.Net, like all web pages are stateless.
  • Every time you click and button or use control
    that causes postback the page is re-rendered from
    the server
  • Information is not retained between postbacks
    without some additional programming. (Windows
    forms have state. They keep their variable values
    and contents in RAM)
  • This has several implications for web application
    development that we will have to examine later
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