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Storing database connection strings outside the source code is probably the most common configuration task. ASP.NET provides a special section of web.config to store database connection strings called <connectionStrings>. The <connectionStrings> section allows you to store one or more database connection strings that can be retrieved later in your code. To retrieve the connection strings stored in the <connectionStrings> section, you again need to use the ConfigurationManager class. To illustrate the use of the <connectionStrings> section, you will develop a simple employee listing web form. The web form will display a list of employees in a GridView control. To begin, create a new website by using Visual Studio. Add a web.config file to the website by using the Add New Item dialog box (Figure 11-22).

// Weapon reticule weaponTargetTexture = Game.Content.Load<Texture2D>( GameAssetsPath.TEXTURES PATH + "weaponTarget"); // Load game level gameLevel = LevelCreator.CreateLevel(Game, currentLevel); base.LoadContent(); } In the LoadContent method, you first create the SpriteBatch used to draw the game UI. Then, you load the SpriteFont used to write on the screen and the texture for the weapon s reticule sprite. Finally, you call the CreateLevel method of the LevelCreator class to generate the game level, which you store in the class s gameLevel attribute.

Note For well-programmed processes, it s generally not a problem that they re running as root. It s a different story, though, for logging in as the user root.

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Open the web.config file in the IDE and modify the <connectionStrings> section as shown in Listing 11-22. Listing 11-22. Adding a Connection String to the <connectionStrings> Section <connectionStrings> <add name="connectionstring" connectionString="data source=.;initial catalog=Northwind; integrated security=true" providerName="System.Data.SqlClient"/> </connectionStrings> The <connectionStrings> section can contain one or more <add> elements, each defining a database connection string: The name attribute of the <add> element defines a name for that connection string. This name is used later to access the connection string. The connectionString attribute specifies the actual database connection string. Finally, the providerName attribute indicates the .NET data provider that can be used to communicate with the database. Now open the default web form and drag and drop a GridView control onto it. Then type in the code shown in Listing 11-23 in the Page_Load event of the web form. Listing 11-23. Retrieving the Connection String protected void Page_Load(object sender, EventArgs e) { string strConn= ConfigurationManager.ConnectionStrings["connectionstring"].ConnectionString; SqlDataAdapter da = new SqlDataAdapter("SELECT EmployeeID,FirstName, LastName FROM Employees", strConn); DataSet ds = new DataSet(); da.Fill(ds, "employees"); GridView1.DataSource = ds; GridView1.DataBind(); } The code uses the ConfigurationManager class to retrieve the connection string value. The ConnectionStrings collection can be accessed by using an index or a connection string name. In our example, we access it with a name.

PRI: This is the priority indication for the process This number is an indication of when the process will get some CPU cycles again A lower value indicates a higher priority so that the process will have its share of CPU cycles sooner The value RT indicates that it is a real-time process and is therefore given top priority by the scheduler NI: The nice value of the process See Setting Process Priority later in this chapter for more details on nicing processes VIRT: The total amount of memory that is claimed by the process RES: The resident memory size is the amount of memory that is actually mapped to physical memory In other words, it represents the amount of process memory that is not swapped SHR: The amount of shared memory is what the process shares with other processes.

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