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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 ASPNET Empty Web Application from the templates As the template name suggests, Visual Studio creates a web application with no pages It contains a Webconfig file to hold website configuration settings, but nothing else.

Package maintainers can sign their RPM packages before distribution. When a package is signed, a unique ID number is generated and included with the package. This ID is called the package signature and is used by the rpm command to verify that the package came from its original owner. Signing a package requires the use of a tool that follows the OpenPGP standard (RFC2440), which uses a set of keys to encrypt and decrypt data. One such tool is called the Gnu Privacy Guard or GnuPG, and it can be used to create the required keys to sign RPM packages. Using GnuPG, the maintainer will create a secret key and a public key, which will be stored in a structure called a keyring. The secret key contains sensitive information such as the passphrase that is used to encrypt data. This is never distributed by the maintainer. Its primary use is to encrypt data before being sent. With RPM, the secret key can be used to sign packages. The public key that was created will be distributed by the maintainer using either HTTP or FTP. Any user that wants to get the public key can download it and use it to verify the maintainer s rpm package. The user will add the public key to his or her GnuPG keyring using the rpm command, which will use that key along with the package signature for verification. In Listing 7-1, you saw the NOKEY keyword when you installed the zlib devel package. This happened because you do not have the public key for that package. For the next CentOS packages you will install, you will not see that warning because you will put the public keys of all the packages in your install media into your system.

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 HelloWebaspx Visual Studio creates a HelloWebaspxcs code-behind file as part of the web.

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.)

If you are going to install a package that is not included with your CentOS media or that is not created by the CentOS community, it is recommended to verify that the package really came from its owner. You can do that by using the package signature of the package that has been created using an OpenPGP tool such as GnuPG. With that, you must get the public key of the package and import it to your system s GnuPG keyring. After you import the public key, you can verify packages before installation or install the package without any NOKEY warnings. To add a public key into your keyring, you will use RPM s import command, which has this syntax: rpm import gpgkeyfile where gpgkeyfile is the file that contains the package s GPG key.

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:

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.