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Chapter 1: An Introduction To ASP.NET Web Programming

Chapter 1: An Introduction To ASP.NET Web Programming. Liu, Jie. Professor Department of Computer Science Western Oregon University Liuj@wou.edu. Web Applications.

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Chapter 1: An Introduction To ASP.NET Web Programming

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  1. Chapter 1: An Introduction To ASP.NET Web Programming Liu, Jie Professor Department of Computer Science Western Oregon University Liuj@wou.edu

  2. Web Applications • The Client/Server model -- a computation model for PCs to connect to other computers, like the monitor and mainframe architecture model. • Client –sends a request • Thin client • Thick client • Server – answers the requests • For Web based applications • Communication are through HTTP (hypertext Transfer Protocol) • What is a protocol • Client is a browser such as IE (Internet Explorer) • A browser displays pages defined using HTML tags (Hypertext, Markup Language) • Static pages – not going to change • Dynamic pages – formed dynamically according to the requests • The application itself is defined on a web server such as IIS (Internet Information Services), with in turn may interact with other server such as a Database Management System (DBMS) that is hosted on a database server

  3. Web Applications http://sundown.wou.edu:81/en/mail.html?lang=en&laurel=on&cal=1 Port Domain name Page/file Parameter #1 Protocol Path Start of parameters Parameter #2

  4. Dynamic Pages • A dynamic page is generated each time it is called • The same page may be posted back to the server for processing. • Nevertheless, the page itself is stateless, i.e., it will not maintain the value of a variable between each loading of the page

  5. More About State • “State” refers to the values of a variable or object • Variables in a web page is stateless meaning that they do not “remember” their previous values • Methods used to maintain a variable’s state include • Use view state • Use session or application state object • Using static variable (C# feature) • Use cookie • Use database (show Website 3 example and Visual Studio)

  6. A Closer Look at the example • The .ASPX page • Page directives <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> AutoEventWireup allows Page_Load linked with page load event and called when the page is loaded • The .ASPX.CS page using System.Web.UI.HtmlControls; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { … … if (IsPostBack) … …

  7. A Closer Look at the example • More about the Visual Studio in coming chapters • A page and a page behind it (separation of presentation and business logic) • Controls, properties, and events • If I change nTemp to be a static variable, what will happen? • Different between design view and source view

  8. The .Net Framework Structure Remote users over Internet Any Browser Remote Systems Over Internet Any Hardware/OS Local users Traditional Window application .Net Framework ASP.NET Application Services Windows Forms Controls Windows Application Services Web Forms Web Services .Net Compliant Programming Languages ** VB.NET, C++, C#, J++, etc .Net Framework Class Library Common Language Runtime Operating System Windows 2000/2003/NT/98/ME/XP and may be other OSs

  9. VB, C#, and J++ // Declare and initialize a string.string  strFruit = "oranges,apples,peaches,kumquats,nectarines,mangos"; // Declare an array. string[] arrFruit; // Place each word in an array element. arrFruit = strFruit.Split(new Char [] {',', '.', ':'}); // Sort the array. System.Array.Sort(arrFruit); // Put the sorted array back in the string. strFruit = System.String.Join(" ", arrFruit);

  10. Summary • Have general understanding about the following • Web applications • Web page • Stateless • ASP.NET components (IIS, frame work, CLR, etc) • Client/Server • Dynamic pages • URL • Helpful web sites • www.msdn.microsoft.com • www.Asp.net

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