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Some Common Methods and Properties of the Response Object
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The following example uses the Response object and the buffer to return data to the client The first example will write some characters to the browser using buffering; you will see that the entire screen will be drawn in one operation:
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<%@ Page Language="c#" %> <html> <body> <%
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11: Welcome to the Internet and ASPNET
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int i = 0; do { ResponseWrite(" i++; } while (i < 2000); %> </body> <html>
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This program uses a code block between the two tags <% and %>, and this code will write 2000 Euro symbols in the browser using the buffer We use a do while loop to generate the characters In the next example, we will turn off the buffering Notice how the display is drawn one character at the time PART III
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<%@ Page Language="c#" %> <html> <body> <% int i = 0; ResponseBuffer = false; do { ResponseWrite(" @ "); i++; } while (i < 2000); %> </body> <html>
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In this example, we turned off the buffering by setting the ResponseBuffer property to False the display will be in steps The effect might be more pronounced on slower servers
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The Server Object
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When our program need to interact with the web server to create server based objects or finding out about any error messages the web server has experienced it can use the Server object, the Server object represents the actual web server The Server object is made available through the Page object in the same way as the Request and Response objects were The Server object is based on the HttpServerUtility class The functionality that is provided through the Server object is based on a set of general tools that are useful when building ASPNET applications Table 11-5 lists the most common methods and properties of the Server object
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State or No State
The traditional Internet model is one where clients and servers operate in a stateless mode, meaning that the server never remembers the client once it has disconnected
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Description
ClearError() CreateObject() GetLastError() Transfer() UrlDecode()
UrlEncode()
Clears the current error (exception) Creates a server-based COM object Returns the previous error (exception) Stops processing the current page and loads the page transferred to Converts an encoded URL to a normal string For example, if we received great+%26+small+%26+creatures from the client, the UrlDecode() method would convert it into the string great & small & creatures Converts a string to follow the rules of web addresses When you want to pass a string to the server in the URL (web address), you need to convert the string If you want to use the URL hejaaspx query=great & small & creatures , there will be an error (because , & , and spaces are illegal in URLs) The UrlEncode() method converts all the illegal characters to the quoted (encoded) versions A part of the preceding string becomes great+%26+small+%26+creatures Spaces are quoted as + and & as %26
Table 11-5
Members of the Server Object
from the server However, there are many very good reasons why you want to remember the client, or to keep state: State An application that maintains state will remember (or persist) the data defining the client, such as the name, e-mail address, customer number, phone number, and so on Keeping state has a price tag we must store the data somewhere and possibly send and receive extra data across the network Stateless A stateless application never remembers anything about the client There is no overhead associated with storing data One common debate among web developers is where to store the shopping cart in an e-mall: on the client or on the server ASPNET gives you a large number of solutions that will help you maintain state in your web application, either by storing the information on the server in the objects provided for this purpose (the Application and Session objects) or on the client using cookies State is the common term for any data defining an object, so we can refer to state as anything that is part of the application or the client session When we refer to application state, we mean data that is globally used in the entire application, while session state refers to data that is focused on one user (one session) The following list should give you some ideas of what we mean by the term state: The string that contains the company addresses and phone information of the web sites company is application state
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