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catalog containing things that the sender assumes he would be interested in, and Helena Hughes getting a catalog from the same company with a different selection of products. Several catalogers have tried this. It is technically possible. However, the increase in sales was disappointing. Personalization of catalogs is expensive, and so few catalogers do it because the increased sales from personalization are not suf cient to cover the cost of personalization. Catalogers print 500,000 or more identical copies, trying to get the per-piece cost as low as possible. They mail these catalogs to their house le plus hundreds of thousands of rented names. This method keeps the marketing costs to a minimum.

Listing 26-5. Using the T nullable Form using System; class Listing 05 { static void Main(string[] args) { // define some nullable types using T syntax int myNullableInt = null; // no value has been assigned so far Console.WriteLine("Nullable variable - has value: {0}", myNullableInt.HasValue); // assign a value myNullableInt = 34; Console.WriteLine("Nullable variable - has value: {0}, value: {1}", myNullableInt.HasValue, myNullableInt.Value); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } }

One issue that arises with nullable types is when you come to assign their value to non-nullable type variables, like this: int myNullable = null; int myRegularInt = myNullable.Value; The Nullable<int> hasn t been assigned a value that the regular int can represent, so the second statement throws a System.InvalidOperationException. We could address this by testing to see whether a value has been assigned and, if not, assign a value that int can represent, like this: int myRegularInt; if (myNullable.HasValue) { myRegularInt = myNullable.Value; } else { myRegularInt = 0; } A neater way of achieving the same effect is to use the null-coalescing operator ( ), as demonstrated in Listing 26-6.

xml xml xml.datatype xml.datatype xml.namespace xml.namespace xml.parsers xml.parsers xml.transform xml.transform xml.transform.dom xml.transform.dom xml.transform.sax xml.transform.sax xml.transform.stax xml.transform.stream xml.transform.stream xml.validation xml.validation xml.xpath xml.xpath Delta

Listing 26-6. Using the Null-Coalescing Operator using System; class Listing 06 { static void Main(string[] args) { int myNullable = null; int myRegularInt = myNullable 0; Console.WriteLine("Int value: {0}", myRegularInt); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The null-coalescing operator is used in conjunction with a nullable type, as shown in bold in Listing 26-6. If the nullable type has been assigned a non-null value, then this will be assigned to the int. If the nullable type has been assigned null, then the value to the right of the operator ( ) will be assigned to the int instead. In Listing 26-6, the nullable int has been assigned null, so the value to the right is used instead (0). Compiling and running Listing 26-6 produces the following results: Int value: 0 Press enter to finish

Almost every code listing in this book uses the System.Console class at the end of the Main method, like this: Console.WriteLine("Press enter to finish"); Console.ReadLine(); But the Console class has more features, as the following sections demonstrate.

There is a form of personalization for catalogers, however. Most catalogers produce 10 to 15 different books per year. One cataloger, for instance, may produce some books featuring dress clothes, some with sports clothes, and some with children s clothes. If a customer buys children s clothes, she will get the children s clothes catalogs. This sounds like personalization. But herein lies a problem: The catalog s house le of previous buyers is often very small relative to the rented list of external names. Previous buyers are always the best responders. Why leave a previous buyer out of the sports clothing catalog mailing just because all she has bought before was children s clothes It does not make economic sense. So previous buyers will get all the catalogs. Where does database marketing gure in that If you cannot personalize your communications, you cannot really do database marketing, so few catalogers spend any money on database marketing. That is, they didn t until the advent of the Web.

When you create a console application in Visual Studio, the Console class can be exceptionally useful, as the two previous statements demonstrate. The first writes a message for the user to see, and the second reads a line of input from the user. Table 26-2 describes the set of related static methods in the Console class that you can use to read from and write to the console.

Read() ReadLine() ReadKey(), ReadKey(bool) Write(bool), Write(char), Write(int), and so on WriteLine(bool), WriteLine(char), WriteLine(int), and so on

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