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At the same time, we as suppliers have all lost We have thousands, hundreds of thousands, or millions of customers, but we don t know them, and they don t know us Loyalty has gone out the window If you talk to an employee in a supermarket, you are interrupting his regular work, which is certainly not standing by the entrance and chatting with the customers You are loyal to that supermarket until tomorrow s newspaper, when a certi cate from somewhere else leads you to drive to another store In the mid-1980s, computers came into wide use This development enabled merchants to begin to bring back some of the intimacy that prevailed in the presupermarket days The software and hardware became increasingly sophisticated, and their prices have been in a free fall for years.

Compilation symbol [Conditional( "DoTrace" )] static void TraceMessage(string str) { Console.WriteLine(str); }

The following code shows a full example of using the Conditional attribute. Method Main contains two calls to method TraceMessage. The declaration for method TraceMessage is decorated with the Conditional attribute, which has the compilation symbol DoTrace as its parameter. So if DoTrace is defined, the compiler will include the code for all the calls to TraceMessage. Since the first line of code defines a compilation symbol named DoTrace, the compiler will include the code for both calls to TraceMessage.

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As a result, it is now possible to keep, economically, in a computer the kind of information on customers that the old corner grocer used to keep in his head and to use that to build lasting, pro table relationships with customers Many companies have collected huge amounts of data about customers and their transactions, but they have failed to make pro table use of these data There is one principle that has remained true throughout the period since 1985: Database marketing is effective in building customer loyalty and repeat sales only if the customer bene ts from it The customer has to think, I m glad that I m in that database because , with the supplier lling in a meaningful end to the sentence If the database does not touch the customer s life in some way that is satisfying to her,.

#define DoTrace using System; using System.Diagnostics; namespace AttributesConditional { class Program { [Conditional( "DoTrace" )] static void TraceMessage(string str) { Console.WriteLine(str); } static void Main( ) { TraceMessage("Start of Main"); Console.WriteLine("Doing work in Main."); TraceMessage("End of Main"); } } } This code produces the following output: Start of Main Doing work in Main. End of Main If you comment out the first line so that DoTrace is not defined, the compiler will not insert the code for the two calls to TraceMessage. This time, when you run the program, it produces the following output: Doing work in Main.

The .NET Framework predefines a number of attributes that are understood and interpreted by the compiler and the CLR. Table 24-2 lists some of these. The table uses the short names, without the Attribute suffix. For example, the full name of CLSCompliant is CLSCompliantAttribute. Table 24-2. Important Attributes Defined in .NET

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