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1. Open web.config and add the following entries to the <appSettings> node: <appSettings> <add key="MailServer" value="mail server address" /> <add key="MailUsername" value="mail username " /> <add key="MailPassword" value="mail password" /> <add key="MailFrom" value="mail address" /> <add key="EnableErrorLogEmail" value="true" /> <add key="ErrorLogEmail" value="errors@example.com" /> <add key="ProductsPerPage" value="6"/> <add key="ProductDescriptionLength" value="60"/> <add key="SiteName" value="BalloonShop"/> </appSettings> 2. Open the BalloonShopConfiguration class and add two fields, whose values are loaded once by the static constructor of the class: public static class BalloonShopConfiguration { // Caches the connection string private static string dbConnectionString; // Caches the data provider name private static string dbProviderName; // Store the number of products per page private readonly static int productsPerPage; // Store the product description length for product lists private readonly static int productDescriptionLength; // Store the name of your shop private readonly static string siteName;

The first exercise in this section uses a one-variable data table to forecast the average amount of time it would take to run various distances at a single race pace. This exercise s data is on the Ridge Running Exercises.xls workbook s Race Paces 1 worksheet, as shown in Figure 5-4. This worksheet contains the following information: Column A (cells A4 through A17) displays the number of miles, 1 through 13.1 (the length of a half-marathon race is 13.1 miles). Column B (cells B4 through B17) will display the average number of minutes to run the various distances at the race pace in cell B3. Use a one-variable data table to calculate the average amount of time it would take to run from 1 through 13.1 miles at an 8.5-minute-per-mile pace. Figure 5-4. The blank onevariable race paces worksheet

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// Initialize various properties in the constructor static BalloonShopConfiguration() { dbConnectionString = ConfigurationManager.ConnectionStrings["BalloonShopConnection"]. ConnectionString; dbProviderName = ConfigurationManager.ConnectionStrings["BalloonShopConnection"].ProviderName; productsPerPage = System.Int32.Parse(ConfigurationManager.AppSettings["ProductsPerPage"]); productDescriptionLength = System.Int32.Parse(ConfigurationManager.AppSettings ["ProductDescriptionLength"]); siteName = ConfigurationManager.AppSettings["SiteName"]; } 3. Also in the BalloonShopConfiguration class, add the corresponding properties to return the values of the fields you ve added in the previous step: // Returns the maximum number of products to be displayed on a page public static int ProductsPerPage { get { return productsPerPage; } } // Returns the length of product descriptions in products lists public static int ProductDescriptionLength { get { return productDescriptionLength; } } // Returns the length of product descriptions in products lists public static string SiteName { get { return siteName; } }

create groupings. You can then filter individual instances based on refinements of the grouping. All of this is possible in the C# language using the keywords as and is, which allow queries of subclassed types of an instance. The queries are noninvasive and do not cause exceptions to be thrown. The queries give you the ability to make decisions based on whether an instance would like to be associated with a particular grouping based on an interface.

The productsPerPage and productDescriptionLength fields are marked as readonly. This mainly means that after setting their values in the class constructor, you can t change their values any more in any method. If you re curious to find more details about readonly and how readonly is different from const, read on. The major similarity between the readonly and const fields is that you aren t allowed to change their values inside class methods or properties. The main difference is that whereas for constants you need to set their value at the time you write the code (their values must be known at compile-time), with readonly fields you are allowed to dynamically set their values in the class constructor. Constant values are always replaced with their literal values by the compiler. If you look at the compiled code, you ll never know constants were used. You can use the const keyword only with value types (the primitive data types: Int, Char, Float, Bool, and so on), but not with reference types (such as the classes you re creating). readonly fields are handled differently. They don t have to be value types, and they can be initialized in the class constructor. Static readonly fields can be initialized only in the static class constructor, and instance readonly fields can be initialized only in the instance class constructor. Note that in case of readonly fields of reference types, only the reference is kept read-only. The inner data of the object can still be modified. A good example is an array, whose elements can be modified even if the array itself is read-only.

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