rdlc barcode PART III in C#

Generate Universal Product Code version A in C# PART III

PART III
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Scanning Universal Product Code Version A In Visual C#.NET
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Figure 13-19
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The ASPNET form
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MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide
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binary string, and the current form, as represented by the values of the controls That gives ASPNET the ability to maintain the state of the form There is one other postback issue to look at, and it focuses on the Page_Load() event handler of the Web Form, which will be called for every postback We normally reset the form in the Page_Load() event handler, but resetting the form rather than persisting the state would defeat our purposes IHowever, there is one property of the Page object that is available to us and can prevent this problem We can test whether the IsPostBack property is True or False, as shown in the following code segment:
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private void Page_Load(object sender, SystemEventArgs e) { // Test if this is a postback event if (!IsPostBack) { // Put user code to initialize the page here // any subsequent visits to this page will result in // that this block will be bypasses } }
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Now that we have looked at how postback maintains the data for a form between server calls we will need to look at some of the issues with postback and controls The postback process only works with the server controls supplied with ASPNET, and it is by default initiated only by the Button control All other events are queued on the client and sent to the server during the next postback event There are also some events that cannot be processed by the server using this model, such as the MouseOver event, which can only be handled by writing traditional client-side scripts Any event that will be called repeatedly and will need immediate feedback while the page is being viewed must be handled on the client side The mouse events are such events If you need to have a control trigger the postback, you must set the AutoPostBack attribute of the control to True (the default is False) The following code illustrates the use of AutoPostBack:
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<%@ Page language="c#" Codebehind="WebForm1aspxcs" AutoEventWireup="false" Inherits="AddressBookWebForm1" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 40 Transitional//EN" > <HTML> <HEAD> <title>WebForm1</title> <LINK REL="STYLESHEET" TYPE="text/css" HREF="AddressBookcss"> </HEAD> <body MS_POSITIONING="GridLayout"> <h1 align="center">Address Book</h1> <br> <form id="Form1" method="post" runat="server"> <asp:ListBox id="lstAddress" AutoPostBack="True"></asp:ListBox> </form> </body> </html>
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13: Server-Side Programs and Postback Operations
UPC-A Generation In VS .NET
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Be very careful with the use of AutoPostBack There is additional overhead associated with the postback process, and raising the AutoPostBack event from numerous components will adversely affect the application The state of the page or the view is controlled by setting the EnableViewState attribute for the control, or for the entire page If you have controls on the form that do not need to have their state maintained by the postback process, you should mark those controls EnableViewState properties to False (the default is True) When you set the EnableViewState property to False, the control will not participate in the postback event :
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<asp:label EnableViewState="False" runat="server"/>
To disable view state for an entire page, set the @ Page directive s Enable ViewState attribute to False, as in this example: PART III
<@ Page EnableViewState="False">
Summary
This chapter has taken you through the server-side neighborhood of NET, from the ASPNET objects (Request, Response, Session, Application, Server), through web services and COM components, to the waters of platform invoke The amount of space devoted to these topics in the chapter reflects their relative importance on the exam The topic of web services is not supposed to be in the exam, but we feel that it is still a topic that might show up, so be prepared to know the basics about how to build a web service You might expect combination questions that use information from this chapter to set the background for another question
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