ASP.NET Master Pages.
Here are some of the benefits of using a master page in ASP.NET:
Consistency: A master page ensures that all pages in your web application have a consistent look and feel. You can define the common layout and design elements in the master page and then reuse them on all the content pages.
Separation of Concerns: A master page separates the layout and design elements from the content of the web pages. This means that developers can focus on creating the content of the pages without worrying about the design.
Easy Maintenance: With a master page, you can make changes to the layout and design of your web application in one place. All the content pages that use the master page will automatically inherit the changes.
Flexibility: You can create multiple master pages for different sections of your web application. For example, you can have one master page for the public-facing pages and another master page for the administrative pages.
To use a master page in ASP.NET, you need to create a master page file (.master) and define the layout and design elements in it. Then, you can create content pages (.aspx) that inherit from the master page and add the specific content for each page. When a content page is requested, ASP.NET will merge the content of the content page with the layout of the master page to create the final HTML output.
Here's an example of how to create and use a master page in ASP.NET:
- Create a new ASP.NET Web Application project in Visual Studio.
- Right-click on the project and select "Add New Item."
- Choose "Master Page" from the templates list and give it a name (e.g. "Site.master").
- In the master page, define the common layout and design elements, such as the header, footer, and navigation menu. Here's an example:
php<%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Site.master.cs" Inherits="MyWebApp.Site" %>
<!DOCTYPE html>
<html>
<head>
<title>My Web App</title>
<!-- common stylesheets and scripts -->
</head>
<body>
<div id="header">
<!-- header content -->
</div>
<div id="menu">
<!-- navigation menu -->
</div>
<div id="content">
<!-- content pages will replace this div -->
<asp:ContentPlaceHolder ID="MainContent" runat="server" />
</div>
<div id="footer">
<!-- footer content -->
</div>
</body>
</html>
- Create a new content page that will use the master page. Right-click on the project and select "Add New Item."
- Choose "Web Form" from the templates list and give it a name (e.g. "Home.aspx").
- In the content page, define the specific content for that page. Here's an example:
javascript<%@ Page Title="Home" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Home.aspx.cs" Inherits="MyWebApp.Home" %>
<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server">
<h1>Welcome to My Web App</h1>
<p>This is the home page of my web app.</p>
</asp:Content>
- Run the web application and navigate to the content page (e.g. http://localhost:12345/Home.aspx). The content page will be displayed with the common layout and design elements from the master page.
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