qr code generator c# code project Using Master Pages, Themes, and Caching in C#.NET

Drawing QR Code ISO/IEC18004 in C#.NET Using Master Pages, Themes, and Caching

ChAPTER 2
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QR Code Reader In C#
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Using Master Pages, Themes, and Caching
Paint Bar Code In C#.NET
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Decode Barcode In Visual C#
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Referencing Controls in the Master Page
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In addition to properties, you can also reference and update controls in the master page from an individual content page. One way is to encapsulate the control s property in a property of the master page (as demonstrated earlier). This is often a clean solution, as the master page developer is exposing these properties on purpose and thereby creating a contract with the content pages. The other means of referencing a control on the master page from a content page is through the Master.FindControl method. You need to supply this method with the name of the control you want it to find. This approach requires the content page to have knowledge of the master page. Master.FindControl returns a Control object, which you then need to cast to the correct control type. After you have this reference, you can read or update the object as if it were local to the content page. The following code (which belongs in the Page_Load method of the content page) demonstrates this method by updating a Label control named Brand in the master page.
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Sample of Visual Basic Code Dim MyLabelBrand As Label = CType(Master.FindControl("LabelBrand"), Label) MyLabelBrand.Text = "Fabrikam" Sample of C# Code Label MyLabelBrand = (Label)Master.FindControl("LabelBrand"); MyLabelBrand.Text = "Fabrikam";
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In this example, a local variable named MyLabelBrand is set to reference a Label control on the master page. After you have this reference, you can use it to customize information in a master page s LabelBrand control.
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Creating Nested Master Pages
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Sometimes, web design might require multiple levels of master pages. For example, every single page on your site might have the same logo, search box, and copyright information. However, although pages within your online store might include navigation for product categories and a shopping cart link, pages within the community discussion section of your site would include forum navigation and links for user profile management. In this scenario, you could create a top-level master page for the logo, search box, and copyright information. You could then nest different master pages for the store and community sections of your website. You can create a child master page from the Add New Item dialog box in Visual Studio by selecting the Select Master Page check box, as shown in Figure 2-2. You will then need to select the parent master page. Visual Studio will automatically specify the necessary declarations.
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Lesson 1: Using Master Pages
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Make UPC - 13 In Java
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ChAPTER 2
Bar Code Scanner In .NET
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EAN-13 Supplement 5 Decoder In Visual Basic .NET
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FigURE 2-2 Declaring a child master page.
When nested, child master pages still use the .master extension. However, the child master pages also define the attribute MasterPageFile set in the @ Master declaration. This attribute points to the parent master page. The following example demonstrates a child master page with a parent master page named Site.master.
<%@ Master Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="CommunityMasterPage.master.cs" Inherits="Account_CommunityMasterPage" %> <asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" Runat="Server"> </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" Runat="Server"> <h2>Sub Department</h2> <asp:panel runat="server" id="panel1" backcolor="LightBlue"> <asp:ContentPlaceHolder ID="ContentPlaceHolderSubDept" runat="server" /> </asp:panel> </asp:Content>
The child master page typically contains content controls that are mapped to content placeholders on the parent master page. In this respect, the child master page is laid out like any content page. However, the child master page also has one or more content placeholders of its own. This defines the areas where its content pages can put their content.
Dynamically Changing Master Pages
You define the master page in a content page s @ Page declaration. However, that doesn t mean you cannot switch to a different master page programmatically. Changing master pages allows you to provide different templates for different users. For example, you might give users a choice of different colors and styles (you can also do this with themes, as discussed in the next lesson). You could also use different master pages to format data for different browsers or different mobile devices.
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