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) Also, just before the outgoing response is emitted back to the requesting browser, the __VIEWSTATE data is used to repopulate the form s widgets Clearly, the best thing about this aspect of ASPNET is that it just happens without any work on your part Of course, you are always able to interact with, alter, or disable this default functionality if you so choose To understand how to do this, let s see a concrete view state example..

public void doGet (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { PrintWriter out = res.getWriter(); Document doc; try { doc = getXml(); Element root = doc.getRootElement(); Element element = new Element("user"); Attribute commonName = new Attribute("commonname", req.getParameter("cn")); Attribute lastName = new Attribute("lastname", req.getParameter("ln")); Attribute email = new Attribute("email", req.getParameter("em")); Attribute username = new Attribute("username", req.getParameter("us")); Attribute password = new Attribute("password", req.getParameter("ps")); element.addAttribute(commonName); element.addAttribute(lastName); element.addAttribute(email); element.addAttribute(username); element.addAttribute(password);

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First, create a new Empty Web Site called ViewStateApp and insert a new Web Form On your aspx page, add a single ASPNET ListBox web control named myListBox and a single Button control named btnPostback Handle the Click event for the Button to provide a way for the user to post back to the web server: public partial class _Default : SystemWebUIPage { protected void Page_Load(object sender, EventArgs e) { } protected void btnPostback_Click(object sender, EventArgs e) { // No-op This is just here to allow a postback } } Now, using the Visual Studio 2010 Properties window, access the Items property and add four ListItems to the ListBox using the associated dialog box The resulting markup looks like this: <asp:ListBox ID="myListBox" runat="server"> <asp:ListItem>Item One</asp:ListItem> <asp:ListItem>Item Two</asp:ListItem> <asp:ListItem>Item Three</asp:ListItem> <asp:ListItem>Item Four</asp:ListItem> </asp:ListBox> Note that you are hard-coding the items in the ListBox directly within the *.

HTML server controls provide a relatively fast way to migrate to ASP .NET, but not necessarily the best way. For one thing, the names of HTML controls and their attributes are not always intuitive, and they don t have the same design-time support for attaching event handlers. The HTML controls also have certain limitations, such as that style properties must be set through CSS syntax (which is more difficult than setting a direct property) and that change events can t be raised until the page is posted back in response to another action. Finally, HTML server controls can t provide user interface elements that aren t already defined in the HTML standard. If you want to create some sort of aggregate control that uses a combination of HTML elements to render a complex interface, you re on your own. To address these issues, ASP.NET provides a higher-level web control model. All web controls are defined in the System.Web.UI.WebControl namespace and derive from the WebControl base class, which provides a more abstract, consistent model than the HTML server controls. Web controls also enable additional features, such as automatic postback. But the really exciting part is that many extended controls don t just map a single HTML tag but instead generate more complex output made up of several HTML tags and JavaScript code. Examples include lists of check boxes, radio buttons, calendars, editable grids, and so on. Figure 4-6 shows a portion of the inheritance hierarchy for web controls.

aspx file As you already know, all <asp:> definitions in an HTML form will automatically render back their HTML representation before the final HTTP response (provided they have the runat="server" attribute) The <%@Page%> directive has an optional attribute called EnableViewState that by default is set to true To disable this behavior, simply update the <%@Page%> directive as follows: <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Defaultaspxcs" Inherits="_Default" EnableViewState ="false" %> So, what exactly does it mean to disable view state The answer is, it depends Given the previous definition of the term, you would think that if you disable view state for an *aspx file, the values in your ListBox would not be remembered between postbacks to the web server.

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