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master page However, the content page shouldn t have complete freedom to change the master page indiscriminately Instead, anything other than these three presets should be disallowed To enable scenarios such as these, you need some level of programmatic interaction between the content page and the master page This isn t too difficult, because you can access the current instance of your master page using the PageMaster property, as described in the previous section The first step in allowing interaction between your content page and master page is to add public properties or methods to your master page class The content page can then set these properties or call these methods accordingly For example, maybe you want to make the banner text customizable (as shown in a previous example) but you don t want to let the content page insert any type of content there.

Instead, you want to restrict it to a single descriptive string To accomplish this, you can add a server-side label control to the header and provide access to that control through a BannerText property in the master page class: public string BannerText { get { return lblTitleContentText; } set { lblTitleContentText = value; } } The content page can now change the text The only caveat is that the Master property returns an object that s typed as the generic MasterPage class You need to cast it to your specific master page class to get access to any custom members you ve added protected void Page_Load(object sender, EventArgs e) { CustomizableMasterPage_master master = (CustomizableMasterPage_master)Master; masterBannerText = "Content Page #1"; } Another way to get strongly typed access to the master page is to add the MasterType directive to the content page.

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After IIS receives the request with the appropriate authentication data, it verifies that authentication data either against a local data store or Active Directory and either rejects or accepts the authentication. If authentication fails, IIS generates another 401 Unauthorized HTTP error and allows the browser to attempt authentication again. If authentication succeeds, IIS creates an access token for the user.

<%@ Register Assembly="ControlsBook2Lib" Namespace= "ControlsBook2Lib.Ch08" TagPrefix="apress" %> <asp:Content ID="Content1" ContentPlaceHolderID="NumAndTitle" runat="server"> <asp:Label ID="NumberLabel" runat="server" Width="14px">8</asp:Label>   <asp:Label ID="TitleLabel" runat="server" Width="360px"> Integrating Client-Side Script</asp:Label> </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="PrimaryContent" runat="server"> <apress:FormConfirmation ID="confirm1" runat="server" Message= "formconfirmation: Are you sure you want to submit " /> <br /> <asp:Button ID="button1" runat="server" Text="Button" OnClick="Button_Click" /> <br /> <asp:LinkButton ID="linkbutton1" runat="server" Text="LinkButton" OnClick="LinkButton_Click" /><br /> <apress:ConfirmedLinkButton ID="confirmlink1" runat="server" Message="confirmedlinkbutton: Are you sure you want to submit " OnClick="ConfirmLinkButton_ClickClick">ConfirmedLinkButton </apress:ConfirmedLinkButton> <br /> <br /> <br /> <asp:Button ID="Button2" runat="server" Text="Reset Status" onclick="Button2_Click" /> <asp:Label ID="status" runat="server" Text="Click a button."/> </asp:Content> Listing 8-10. The Confirm Web Form Code-Behind Class File using System; namespace ControlsBook2Web.Ch08 { public partial class Confirm : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void Button_Click(object sender, System.EventArgs e) { status.Text = "Regular Button Clicked! - " + DateTime.Now; } protected void LinkButton_Click(object sender, System.EventArgs e) { status.Text = "LinkButton Clicked! - " + DateTime.Now; }

All you need to do is indicate the virtual path of the corresponding master file: <%@ MasterType VirtualPath="~/SiteTemplatemaster" %> Now you can use simpler strongly typed code when you access the master page: protected void Page_Load(object sender, EventArgs e) { MasterBannerText = "Content Page #1"; } You should note one point about these examples When you navigate from page to another, all the web-page objects are re-created This means that even if you move to another content page that uses the same master page, ASPNET creates a different instance of the master page object As a result, the Text property of the Label control in the header is reset to its default value (a blank string) every time the user navigates to a new page.

To change this behavior, you need to store the information in another location (such as a cookie) and write initialization code in the master page to check for it You can also get access to an individual control on a master page through brute force The trick is to use the MasterPageFindControl() method to search for the object you want based on its unique name When you have the control, you can then modify it directly Here s an example that uses this technique to look for a label: Label lbl = MasterFindControl("lblTitleContent") as Label if (lbl != null) { lblText = "Content Page #1"; }.

Note IIS always generates an access token for each request it passes to ASP.NET. If the user has not explicitly authenticated with IIS (for example, Anonymous or Forms Authentication is in use), then IIS generates an access token using the anonymous account (normally IUSR_<machinename>) configured in the IIS virtual directory settings.

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