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protected override void OnBeforeInstall( System.Collections.IDictionary savedState) { base.OnBeforeInstall(savedState); } protected override void OnBeforeUninstall( System.Collections.IDictionary savedState) { base.OnBeforeUninstall(savedState); } } } The previous example includes overrides for the OnBeforeInstall and OnBeforeUninstall methods, which are called immediately before the installation of the website and before the uninstall process of your site. As such, these methods are perfect when including additional installation steps such as creating a database on a SQL Server or when uninstalling (removing, or detaching, a database from SQL Server). Information about the current installation process, such as target directories or other information entered through the setup user interface or passed in as command-line parameters to the setup package, is available through the base.Context.Parameters collection of the Installer base class. The following example defines an installer class that creates a database during the installation of your web application and drops a database during the uninstall process of your web application: [RunInstaller(true)] public partial class DbInstaller : System.Configuration.Install.Installer { public DbInstaller() { InitializeComponent(); } protected override void OnBeforeInstall( System.Collections.IDictionary savedState) { try { SqlConnection conn = new SqlConnection(); conn.ConnectionString = @"data source=(local)\SQL2005;" + "integrated security=SSPI;initial catalog=master"; conn.Open(); try { // Create the database SqlCommand cmd = new SqlCommand(); cmd.Connection = conn; cmd.CommandText = "CREATE DATABASE TestDb"; cmd.ExecuteNonQuery(); // Now close the connection and connect to the // created TestDb database to create the tables // ...

stopButton = (Button) this.findViewById(R.id.EndButton); startButton = (Button) this.findViewById(R.id.StartButton); stopButton.setOnClickListener(this); startButton.setOnClickListener(this); stopButton.setEnabled(false); startButton.setEnabled(false); bufferValueTextView = (TextView) this.findViewById(R.id.BufferValueTextView); statusTextView = (TextView) this.findViewById(R.id.StatusDisplayTextView); statusTextView.setText("onCreate");

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} finally { conn.Close(); } } catch { base.Rollback(savedState); } base.OnBeforeInstall(savedState); } protected override void OnBeforeUninstall( System.Collections.IDictionary savedState) { try { SqlConnection conn = new SqlConnection(); conn.ConnectionString = @"data source=(local)\SQL2005;" + "integrated security=SSPI;initial catalog=master"; conn.Open(); try { // Create the database SqlCommand cmd = new SqlCommand(); cmd.Connection = conn; cmd.CommandText = "DROP DATABASE TestDb"; cmd.ExecuteNonQuery(); } finally { conn.Close(); } } catch { base.Rollback(savedState); } base.OnBeforeUninstall(savedState); } } Of course, this is a simple example for explaining the concept of installer classes. As you can see in the previous code sample, for creating the database, you d need to connect to the master database of the server and then execute the CREATE DATABASE statement. Afterward, you d close the connection to the master database and connect to the previously created database for creating all the necessary tables, relationships, constraints, and so on. We suggest you include the SQL scripts for creating the database as an embedded resource to your installer class library to keep the code independent from the database description language parts, but basically that s the way it works.

To download the ASP.NET Development Helper, surf to http://www.nikhilk.net/ Project.WebDevHelper.aspx. There you can download two DLLs, one for the HTTP module (WebDevInfo.dll) and one for the browser plug-in (WebDevInfo.BHO.dll). Copy these to any directory. Then, install the browser extension with the following command line: regsvr32 nStuff.WebDevInfo.BHO.dll Next, you need install the assembly for the HTTP module into the GAC. You can do this by dragging and dropping in Windows Explorer, but it s generally easier to use the gacutil.exe utility. Start a Visual Studio command prompt (choose Programs Visual Studio 2005 Visual Studio Tools Visual Studio 2005 Command Prompt from the Start menu), and then run this command: gacutil /i nStuff.WebDevInfo.dll Now, when you want to use this tool with a web application, you need to modify the web.config file so it loads the HTTP module. The content you need depends on the exact version of the tool you re using, but it looks something like this: <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <system.web> <httpModules> <add name="DevInfo" type="nStuff.WebDevInfo.DevInfoModule, nStuff.WebDevInfo, Version=0.5.0.0, Culture=neutral, PublicKeyToken=8fc0e3af5abcb6c4" /> </httpModules> ... </system.web> </configuration> Now, run one of the pages from this application. To actually call up the browser plug-in, look for a button (with a gear icon) in the browser, which will have been added to the end of the Standard toolbar. When you click this icon, you ll see a display like the one shown in Figure 2-34 (assuming you re currently viewing an ASP.NET page from an application that has the matching HTTP module loaded). You ll see the ASP.NET Developer Helper at work in 3.

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