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ASP.NET Application Fundamentals in C#
2 ASP.NET Application Fundamentals Painting QR In C#.NET Using Barcode generator for .NET Control to generate, create Quick Response Code image in VS .NET applications. www.OnBarcode.comQuick Response Code Recognizer In Visual C#.NET Using Barcode decoder for .NET Control to read, scan read, scan image in .NET framework applications. www.OnBarcode.comHelloWorld .htm file and click Browse . Alternatively, you can type the entire URL into the browser navigation bar: http://localhost/ASPNETStepByStep/helloworld.htm The browser will send an HTTP request to the server . On the Microsoft platform, IIS will see the HTM extension and simply return the contents of the file to the browser . Because the text is marked using standard HTML tags, the browser understands it and displays it correctly . Here s how the file appears to the end browser: Generating Bar Code In C# Using Barcode generation for .NET Control to generate, create bar code image in .NET framework applications. www.OnBarcode.comReading Barcode In Visual C#.NET Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in .NET applications. www.OnBarcode.com5 . . Convert the HTML file to an ASP .NET application . Take the HelloWorld .htm file that you were working on and convert it into a file type that will invoke the ASP .NET runtime . Turning this file into an ASP .NET application involves two small steps: adding a single line to the top of the file (the Page directive) and renaming the file from HelloWorld .htm to HelloWorld .aspx . This text represents an implementation of HelloWorld that works within the ASP .NET framework (be sure to save the file as HelloWorld .aspx by clicking Save HelloWorld .htm As on the File menu): Quick Response Code Creator In .NET Using Barcode creation for ASP.NET Control to generate, create QR Code image in ASP.NET applications. www.OnBarcode.comDenso QR Bar Code Drawer In Visual Studio .NET Using Barcode creator for .NET framework Control to generate, create QR Code ISO/IEC18004 image in VS .NET applications. www.OnBarcode.com<%@ Page Language="C#" %> <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> Make QR Code ISO/IEC18004 In VB.NET Using Barcode drawer for .NET Control to generate, create Denso QR Bar Code image in VS .NET applications. www.OnBarcode.comUPC - 13 Drawer In Visual C#.NET Using Barcode printer for VS .NET Control to generate, create EAN 13 image in Visual Studio .NET applications. www.OnBarcode.comPart I Fundamentals
PDF417 Drawer In C#.NET Using Barcode creator for VS .NET Control to generate, create PDF417 image in VS .NET applications. www.OnBarcode.comUSS Code 128 Generator In Visual C#.NET Using Barcode drawer for Visual Studio .NET Control to generate, create Code128 image in .NET applications. www.OnBarcode.comWhen you fire up your browser and surf to this file in the virtual directory on your computer, you ll see the following in your browser: Drawing Bar Code In C#.NET Using Barcode creation for Visual Studio .NET Control to generate, create barcode image in Visual Studio .NET applications. www.OnBarcode.comMSI Plessey Encoder In C#.NET Using Barcode encoder for Visual Studio .NET Control to generate, create MSI Plessey image in Visual Studio .NET applications. www.OnBarcode.comAdmittedly, it might seem a small feat to simply show some text in a browser . However, it shows how a simple ASP .NET application works when using IIS . . 6 . . View the HTML source that the browser is interpreting . While viewing the content from the previous step in your browser, use the View, Source menu to show the HTML source text being processed by the browser . It should look like this: Painting EAN / UCC - 14 In Java Using Barcode generator for Java Control to generate, create EAN / UCC - 14 image in Java applications. www.OnBarcode.comBar Code Drawer In Visual Basic .NET Using Barcode drawer for Visual Studio .NET Control to generate, create bar code image in VS .NET applications. www.OnBarcode.com<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> Painting Quick Response Code In Java Using Barcode generation for BIRT reports Control to generate, create QR-Code image in Eclipse BIRT applications. www.OnBarcode.comCode 128A Maker In None Using Barcode printer for Font Control to generate, create Code 128 Code Set C image in Font applications. www.OnBarcode.comNotice that this text is almost identical to the text in HelloWorld .aspx (without the Page directive: <%@ Page Language= C# %>) . In this case, you can see that the pageprocessing logic is fairly simple . That is, the ASP .NET runtime is simply spitting out the text within the file . The Page directive appearing at the top of the code is used by the ASP .NET runtime as it compiles the code . The Page directive shown earlier is fairly simple it tells the runtime to compile this code and base it on the Page class and to treat any code syntax it encounters as C# code . ASP .NET supports integrating .aspx files with assemblies, which you see shortly . Painting Barcode In None Using Barcode creator for Word Control to generate, create bar code image in Word applications. www.OnBarcode.comReading Barcode In Java Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications. www.OnBarcode.com 2 ASP.NET Application Fundamentals
EAN13 Recognizer In Visual C#.NET Using Barcode scanner for .NET framework Control to read, scan read, scan image in .NET applications. www.OnBarcode.comANSI/AIM Code 128 Encoder In Objective-C Using Barcode maker for iPad Control to generate, create Code 128 Code Set C image in iPad applications. www.OnBarcode.comIn subsequent examples, you can see how ASP .NET compiles code on the fly and stores the assemblies in a temporary directory . There s no C# code in HelloWorld .aspx, so you should add some now . A .Note .About .Application .Pools
In addition to mapping incoming HTTP requests to actual physical directories, IIS 6 .x and IIS 7 .x support a feature called application pooling . One of the primary purposes behind application pooling is to support application isolation . For example, imagine you want to isolate the Web applications running in the same computer from other software managed by IIS . By creating a separate application pool for each Web application, you tell IIS to run each application in its own worker process . If anything bad happens in one application pool, the other applications can continue to run unaffected . With application pooling, you also can govern the security aspects of a Web application . Some applications might need a higher degree of security than do others . IIS 5 .x runs the ASP .NET worker process as LocalSystem . LocalSystem has system administrator rights . This has interesting implications because the account can access virtually any resource on the server . In IIS 6 .x and IIS 7 .x, you can set the identity of the worker process to be the same as that of the application pool level . Application pools operate under the NetworkService account by default which does not have as many access rights as LocalSystem does .
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