building applications using asp.net and c# / session 5 / 1 of 19 session 5

Building Applications using ASP.NET and C# / Session 5 / 1 of 19

Session 5Session 5


Session ObjectivesSession Objectives

Discuss the Global.asax file Explain events in Global.asax file Use the Application

object Use the Server object


Global.asaxGlobal.asax

Stored in Root Directory of application

Defines boundary of application

Initialise application or session level variables

Connect to databases

Send cookies


Events in Events in Global.asax - 1Global.asax - 1Events Fired When

Application_OnStart

Fired when the first ASP.NET page in the current application directory (or its sub-directories) is called.

Application_OnEnd

Fired when the last session of the application ends. Also fired when the web application is stopped using the Internet Services Manger snap-in. Application_OnBe

ginRequestFired every time a page request begins (ideally when a page is loaded or refreshed).

Application_OnEndRequest

Fired every time a page request ends (that is every time the page executes on the browser)

Session_OnStart Fired every time a new session begins.

Session_OnEnd Fired when the session ends. For the various ways in which a session can end refer to the session on the Session object.


Events in Events in GlobalGlobal..asax - asax -

22


Application Application Object - 1Object - 1

Represents an instance of an ASP.NET application.

Object[varName]

Application ["greeting"] = "Welcome to my World";


Controlling Controlling AccessAccess

<HTML><script Language ="C#" runat ="server" Debug = "true">void Page_Load(Object Src, EventArgs E){Application.Lock();Application["Counter"] = (Int32) Application ["Counter"] + 1;Application.UnLock();}</script><BODY><br>This page has been visited <%Response.Write(Application ["Counter"]);%> times!!</BODY></HTML>


ArraysArrays<script language="C#" runat="server"> void Application_Start(Object sender, EventArgs E) { String [] job = new String [4]; job[0]= "Faculty"; job[1]= "Programmer"; job[2]= "Salesman"; job[3]= "Manager"; Application ["j"] = job; } </script>

<<HTML> <script Language ="C#" runat ="server" >void Page_Load(Object Src, EventArgs E) {int i = 0; String[] k;k = (String[])Application["j"];for (i = 0; i<k.Length;i++) { Response.Write(k[i] + "<br>"); }}</script></HTML>


Server ObjectServer Object

Execute and Transfer HTMLEncode URLEncode MapPath

Property Description

ScriptTimeout

Is used to specify the period for which a script can run on the server before it is terminated. Machine

NameIs used to get the machine name of the server.

Server.property | method


Execute Execute MethodMethod

<%@ Page Debug ="true"%><html><script language="C#" runat="server">void clicked (Object Src, EventArgs E){Server.Execute("/test/ses6ex1.aspx");}</script><form runat ="server"><asp:button id = "btn1" onclick = "clicked" Text =" Click me to transfer execution" runat = "server" /></form></html>


Transfer Transfer MethodMethod

Server.Transfer("/test/transfer.aspx");


HTMLEncode HTMLEncode MethodMethod

Response.Write( Server.HtmlEncode("<H1> is an example of a Heading tag</H1>")); Response.Write( Server.HtmlEncode("<H1> is an example of a Heading tag</H1>"));

Server.HTMLEncode (string)

Response.Write("<br><H1> is an example of a Heading tag</H1>"); Response.Write("<br><H1> is an example of a Heading tag</H1>");


URLEncode URLEncode Method - 1Method - 1

Response.Write(Server.UrlEncode("http://localhost/code/map.aspx"));Response.Write(Server.UrlEncode("http://localhost/code/map.aspx"));

Server.URLEncode (string)



<html><script language="C#" runat="server">void clicked (Object Src, EventArgs E){String name = Server.UrlEncode("John Saunders");Response.Redirect ("http://localhost/code/calendar.aspx?name=" + name);}</script><form runat ="server"><asp:button id = "btn1" onclick = "clicked" Text =" Click me to send values" runat = "server" /></form></html>

<html><script language="C#" runat="server">void clicked (Object Src, EventArgs E){String name = Server.UrlEncode("John Saunders");Response.Redirect ("http://localhost/code/calendar.aspx?name=" + name);}</script><form runat ="server"><asp:button id = "btn1" onclick = "clicked" Text =" Click me to send values" runat = "server" /></form></html>



<html><script language="C#" runat="server">void clicked (Object Src, EventArgs E){String name = Server.UrlEncode("John Saunders");String password = Server.UrlEncode("king");Response.Redirect("http://localhost/code/error.aspx?name=" + name + " &password=" + password);}</script><form runat ="server"><asp:button id = "btn1" onclick = "clicked" Text =" Click me to send values" runat = "server" /></form></html>

<html><script language="C#" runat="server">void clicked (Object Src, EventArgs E){String name = Server.UrlEncode("John Saunders");String password = Server.UrlEncode("king");Response.Redirect("http://localhost/code/error.aspx?name=" + name + " &password=" + password);}</script><form runat ="server"><asp:button id = "btn1" onclick = "clicked" Text =" Click me to send values" runat = "server" /></form></html>


MapPath MapPath MethodMethod

Response.Write( Server.MapPath("/encode.aspx")); Response.Write( Server.MapPath("/encode.aspx"));

Response.Write( Server.MapPath("encode.aspx")); Response.Write( Server.MapPath("encode.aspx"));

Response.Write(Server.MapPath(Request.ServerVariables.Get("PATH_INFO"))); Response.Write(Server.MapPath(Request.ServerVariables.Get("PATH_INFO")));

Server.MapPath (path)

building applications using asp.net and c# / session 5 / 1 of 19 session 5

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