how to generate qr code in c# web application Part I Fundamentals in C#

Encoder QR-Code in C# Part I Fundamentals

Part I Fundamentals
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The .Canonical .Hello .World .Application
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Nearly all programming texts start by using the technology at hand to present the classic string Hello World to the end user . This time, your job is to send the statement Hello World to the awaiting browser . To see how ASP .NET works, you will take the simplest Web page and develop it into an ASP .NET Web application . You won t use Visual Studio quite yet . Visual Studio is such a rich development environment that building and running Web applications with it seems almost like magic . This is a bare-bones example built from scratch so that you can see exactly what s going on before bringing Visual Studio s full capabilities into the picture . You then can examine each iteration along the way to see what ASP .NET is doing .
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Building the HelloWorld Web Application
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. 1 . . Create a directory to hold the Web application files . Using either a command shell or Windows Explorer, create a new folder to hold the Web application files . Although the name of the directory is unimportant to Internet Information Services (IIS), call it something meaningful . This example uses c:\aspnetstepbystepexamples . 2 . . Create an application/virtual directory to hold the files . To start, you need a virtual directory in which to hold the source code . As you saw earlier when examining the Web Application architecture imposed by the Microsoft Windows environment, IIS divides the applications on your server using virtual directories . In addition to providing application management features, IIS creates a mapping between requests coming in over port 80 and some real directory on your computer . Virtual directories show IIS where to find the code you want to execute in your application . Open Control Panel, and then go to Administrative Tools and start Internet Information Services . Expand the nodes in the tree on the left side to expose the Default Web Site node under the Sites node, as shown in the following illustration:
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2 ASP.NET Application Fundamentals
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Then, right-click the Default Web Site node and click Add Application on the shortcut menu . (The illustration shows how to perform this operation in IIS 7 .5 . If you re using earlier versions of IIS, the screen will look slightly different though you can add new virtual directories in the same way .) IIS will ask you to provide a name for the application/virtual directory:
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Name the Web site ASPNETStepByStep . This is the name by which your Web application will be known to the world . For example, when Internet users surf to your Web site, they ll use the following URL: http://www.contoso.com/ASPNETStepByStep The name contoso.com is a fictitious site, only used here for illustration . When you surf to this site on this computer, the server name will be localhost .
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Part I Fundamentals
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The wizard will ask you to provide a physical path for the virtual directory . Either browse to the physical directory you just created or type the name of the directory . Leave the IIS administration tool open; you use other features in the following steps .
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Click OK to create the virtual directory . . 3 . . Start with a simple HTML page . The easiest way to do this is to store some text in an HTML file and browse to it . Notepad works fine for creating a simple HTML file, or you can use Visual Studio to create the HTML file . If you use Visual Studio, start Visual Studio and select File, New, and then click File . Select Text File as the file type, and then click Open . A new, blank file will open in the Visual Studio editor . Type the following HTML text between the opening and closing <body> tags . Save the file as HelloWorld .htm in your new physical directory (the one that you mapped to a virtual directory in the previous step) .
<html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Untitled Page</title> </head> <body> <h1> Hello World </h1> Nothing really showing here yet, except some HTML... </body> </html>
4 . . Browse to the page . There are two ways to do this . First, you can browse to the page by selecting the file from within IIS . Navigate to the directory in IIS (the IIS control panel should still be open if you haven t closed it) . Click the Content View tab near the bottom of the main pane . You ll see the files in the directory . Right-click the
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