free barcode generator in asp.net c# Creating a Web Application in C#.NET

Making QR in C#.NET Creating a Web Application

Creating a Web Application
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Visual Studio offers two ways to build ASP.NET applications. This isn t just a case of two different menu items for the same feature the two options work quite differently in ways Visual Studio doesn t make especially obvious at the point where you make the decision. You can use the New Project dialog, which offers various ASP.NET project templates under the Visual C# Web section, which produce various kinds of web application projects. Alternatively, you can choose File New Web Site from the main menu, and this lets you create various kinds of website projects. Web application projects are fully fledged Visual Studio projects that are built in much the same way as other kinds of projects such as libraries, console applications, or WPF applications. Website projects are somewhat more lightweight there s no .csproj file to represent the project, nor do you need to build the project; your project consists of nothing but source files and you end up copying these to the web server. For this chapter, we ll use a web application project because it s the most similar to all the other project types we ve looked at in this book. To create the simple web form that we will use in the next example, start up Visual Studio .NET and select File New Project. In the New Project dialog, select the Visual C# Web templates and choose ASP.NET Empty Web Application from the templates. As the template name suggests, Visual Studio creates a web application with no pages. It contains a Web.config file to hold website configuration settings, but nothing else. To add a web form, select Project Add New Item and choose Visual C# Web from the templates list on the left. Select the Web Form template, and call it HelloWeb.aspx. Visual Studio creates a HelloWeb.aspx.cs code-behind file as part of the web
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form, which you can see by expanding the HelloWeb.aspx file in the Solution Explorer. (You ll also see a HelloWeb.aspx.designer.cs file which is where Visual Studio puts any code it needs to generate automatically. Don t put any of your own code in there, because Visual Studio deletes and rebuilds that file anytime it needs to change the generated code.)
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Let s take a closer look at the .aspx and code-behind files that Visual Studio created. Look at the HTML view of HelloWeb.aspx. (When you edit an .aspx file, Visual Studio can show three different views. The default view is the Source view, which shows the raw HTML. There are three buttons at the bottom left of the editor that let you switch between a Design view, which shows the content with the layout and design it will have in the browser, the Source view, which shows the raw HTML, or a Split view which shows both.) You can see that a form has been specified in the body of the page using the standard HTML form tag:
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<form id="form1" runat="server">
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ASP.NET web forms require you to have at least one form element to manage the user interaction, so Visual Studio creates one when you add a new .aspx page. The attribute runat="server" is the key to the server-side magic. Any tag that includes this attribute is considered a server-side control to be executed by the ASP.NET Framework on the server.
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Although the form tag is standard HTML, the runat attribute is not. But ASP.NET removes that attribute from the page before sending it to the browser. The attribute only has any meaning on the server side.
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Within the form, Visual Studio provides an opening and closing pair of div tags to give you somewhere to put your controls and text. Having created an empty web form, the first thing you might want to do is add some text to the page. By switching to the Source view, you can add script and HTML directly to the file. For example, we can add content to the div element in the body segment of the .aspx page, as the highlighted line in Example 21-1 shows.
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<%@ Page Language="C#" AutoEventWireup="true" Inherits="ProgrammingCSharpWeb.HelloWeb" %> CodeFile="HelloWeb.aspx.cs"
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server">
<title></title> </head> <body> <form id="form1" runat="server"> <div> Hello World! It is now <%= DateTime.Now.ToString() %> </div> </form> </body> </html>
This will cause it to display a greeting and the current local time:
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