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// 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); } catch (Exception ex) { // write the error to file StreamWriter sw = File.AppendText(Server.MapPath("~/error.log")); sw.WriteLine(ex.Message); sw.Close(); // now rethrow the error throw (ex); } finally { // close the database connection myConnection.Close(); } } } 4. Execute the page. You should immediately be presented with the error shown in Figure 4-9. 5. In Windows Explorer, navigate to the C:\BAND\04 folder, and you ll see that a file called error.log has been created. Open that file. You ll see the error has been logged, as shown in Figure 4-10.

Like with BalloonShop, the CSK also implements a custom search feature instead of relying on SQL Server s Full-Text Search, making it possible to use MSDE as the database server. The typical search method when Full-Text Search is not available is to split the search string into words and then look into the database for these words. However, the search algorithm in the CSK goes the other way round: It takes every word from the searchable database content and verifies whether it exists in the search string. The method doesn t offer much search flexibility, but it works. In BalloonShop, the searchable content is the products names and descriptions. These are split into separate words called search keys. The search keys are saved into a special data table in the database whenever new content is added or updated in the database.

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The difference between ByVal and ByRef is straightforward when you re using value types, such as integers. However, if you use reference types, such as a Product object or an array, you won t see this behavior. The reason is because the entire object isn t passed in the parameter. Instead, it s just the reference that s transmitted. This is much more efficient for large objects (it saves having to copy a large block of memory), but it doesn t always lead to the behavior you expect. To understand the difference, consider this method: Private Sub ProcessProduct(ByVal prod As Product) prod.Price *= 2 End Sub This code accepts a Product object and increases the price by a factor of 2. Because the Product object is passed by value, you might reasonably expect that the ProcessProduct() method receives a copy of the Product object. However, this isn t the case. Instead, the

ProcessProduct() method gets a copy of the reference. However, this new reference still points to the same in-memory Product object. That means that the change shown in this example will affect the calling code.

Figure 4-10. The error has been logged in the error.log file. 6. Switch back to the Source view of the page and fix the intentional error by changing the query to be executed within Page_Load as follows: // create the command string strCommandText = "SELECT ManufacturerID, ManufacturerName FROM Manufacturer ORDER BY ManufacturerName";

Tip To learn more about the CSK, check out another book I co-authored, Building Websites with the ASP.NET Community Starter Kit (Packt Publishing, 2004). Find more details about it at http:// www.CristianDarie.ro/books.html.

So far, the discussion has focused on simple data types and classes. The .NET class library is actually composed of types, which is a catchall term that includes several object-like relatives: Classes: This is the most common type in .NET Framework. Strings and arrays are two examples of .NET classes, although you can easily create your own. Structures: Structures, like classes, can include properties, methods, and events. Unlike classes, they are value types, which alters the way they behave with assignment and comparison operations. Structures also lack some of the more advanced class features (such as inheritance) and are generally simpler and smaller. Integers, dates, and characters are all structures. Enumerations: An enumeration defines a set of integer constants with descriptive names. Enumerations were introduced in the previous chapter. Delegates: A delegate is a method pointer that allows you to invoke a method indirectly. Delegates are the foundation for .NET event handling and were introduced in the previous chapter. Interfaces: They define contracts to which a class must adhere. Interfaces are an advanced technique of object-oriented programming, and they re useful when standardizing how objects interact. You ll learn about interfaces with custom control programming in 25.

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