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Occasionally, a class can override its behavior to act more like a value type. For example, the String type is a full-featured class, not a simple value type. (This is required to make strings efficient, because they can contain a variable amount of data.) However, the String type overrides its equality and assignment operations so that these operations work like those of a simple value type. This makes the String type work in the way that programmers intuitively expect. Arrays, on the other hand, are reference types through and through. If you assign one array variable to another, you copy the reference, not the array (although the Array class also provides a Clone() method that returns a duplicate array to allow true copying). The following table sets the record straight and explains a few common types.

You should already be familiar with error handling in .NET. Here, you ve simply moved some of the code for accessing the database around to fit within the try..catch..finally syntax. First, within the Page_Load event handler, before you get to any error-handling code, you need to create the Connection object. You must do this here, because the Connection object needs to be global to the entire event handler. If you created it in the try block, it wouldn t be available in the catch or the finally block. You create the Connection object without specifying the connection string, like so: SqlConnection myConnection = new SqlConnection(); You then move into the try block. The code here is the same as you ve seen in the previous example; the only difference is that instead of creating the Connection object with the correct connection string, you set the ConnectionString property of the existing Connection object, like so: // configure the connection string strConnectionString = ConfigurationManager. ConnectionStrings["SqlConnectionString"].ConnectionString; myConnection.ConnectionString = strConnectionString; The rest of the code is the same as you had previously (barring the intentional naming of the Manufacturer table incorrectly), except you ve removed the code to close the database connection: // create the command string strCommandText = "SELECT ManufacturerID, ManufacturerName FROM Manufacturers ORDER BY ManufacturerName"; SqlCommand myCommand = new SqlCommand(strCommandText, myConnection); // open the database connection myConnection.Open(); // show the data DropDownList1.DataSource = myCommand.ExecuteReader(); DropDownList1.DataTextField = "ManufacturerName"; DropDownList1.DataValueField = "ManufacturerID"; DropDownList1.DataBind(); // force the first data bind DropDownList1_SelectedIndexChanged(null, null); Whether or not you have an error, you always need to close the database connection. You ve moved the call to Close() to the finally block.

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The disadvantage when searching with LIKE is that the search results are returned in random order. Today s smart search engines provide a ranking system that places the results with higher rankings at the top of the search results page. An intuitive solution for implementing a simple ranking system is to count how many times the words you re searching for appear in the product s name or description. Moreover, you can give higher ranking to products that have matching words in their names, rather than in their descriptions. This solution can t be implemented with LIKE and WHERE. LIKE returns True or False, specifying whether you have a match or not, but can t tell you how many times a word appears in a phrase. Because SQL Server doesn t provide an easy way to count how many times a substring appears in a string, you ll manually implement this functionality as an SQL Server User-Defined Function.

Figure 24-2. Creating a component in Visual Studio Rather than just choosing File New Project to create the class library, you can add it to the same solution as your website. This makes it easy to debug the code in your component while you re testing it with a web page. (On its own, there s no way to run a component, so there s no way to test it.) To create a new class library in an existing web solution, start by opening your website, and then choose File Add New Project. Specify the directory and project name in the Add New Project dialog box. Figure 24-3 shows a solution with both a website and a class library named Components. The website is in bold in the Solution Explorer to indicate that it runs on start-up (when you click the Start button).

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