winforms code 128

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winforms code 128

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From within a class, any function member can access any other member of the class by simply using that member s name. The access modifier is an optional part of a member declaration that specifies what other parts of the program have access to the member. The access modifier is placed before the simple declaration forms. The following is the syntax for fields and methods: Fields AccessModifier Type Identifier Methods AccessModifier ReturnType MethodName () { ... } The five categories of member access are the following. I ll describe the first two in this chapter and the others in 7. private public protected internal protected internal

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Private members are accessible only from within the class in which they are declared other classes cannot see or access them. Private access is the default access level, so if a member is declared without an access modifier, it is a private member. You can also use the private access modifier to explicitly declare a member as private. There is no semantic difference between declaring a private member implicitly as opposed to explicitly. The forms are equivalent. For example, the following two declarations both specify private int members: int MyInt1; private int MyInt2; Access modifier // Implicitly declared private // Explicitly declared private

Public members are accessible to other objects in the program. You must use the public access modifier to specify public access. Access modifier public int MyInt;

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Maria Wallin, marketing manager at the Loyalty Group, arranged for a direct-mail piece to be sent to 50,000 western Canadian farmers who had been active in the program in the 14 months prior to the campaign In addition, mass media ads for the campaign were placed in six farm publications in western Canada The goal of the campaign was to achieve a direct-mail response rate of 5 percent and to encourage 2 percent of those contacted to make purchases at one more farm merchant than they had used the previous spring Air Miles for Business turned to OgilvyOne Worldwide in Toronto for strategic and creative development of the mailing piece, and to Symcor Direct Response for the laser and letter shop production Using the Air Miles member database, they developed 72 different combinations of letter copy and 2952 certi cate sheet combinations, completely driven by past purchase behavior.

The figures in this text represent classes as labeled boxes, as shown in Figure 4-5. The class members are represented as smaller labeled boxes inside the class boxes. Private members are represented enclosed entirely within their class box. Public members are represented sticking partially outside their class box.

Class C1 in the following code declares both public and private fields and methods. Figure 4-6 illustrates the visibility of the members of class C1. class C1 { int F1; private int F2; public int F3; void DoCalc() { ... } public int GetVal() { ... } }

The offer of bonus reward miles was designed to encourage increased spending during the promotional period There was an additional incentive for each farmer to visit one merchant whom he or she had not visited the previous spring A control group of 10,000 western Canadian farmers who were members of the program but did not receive any mailings was set aside The success of the campaign was measured by the overall response rate, the number of farm merchants used, and the number of reward miles earned by those who received the mailing versus those in the control group who did not The result was that 12 percent of the mail universe responded to at least one of the offers, more than double the rst objective.

As mentioned, members of a class can access the other class members by just using their names. For example, the following class declaration shows the methods of the class accessing the fields and other methods. Even though the fields and two of the methods are declared private, all the members of a class can be accessed by any method (or any function member) of the class. Figure 4-7 illustrates the code. class DaysTemp { // Fields private int High = 75; private int Low = 45; // Methods private int GetHigh() { return High; } private int GetLow() { return Low; } public float Average () { return (GetHigh() + GetLow()) / 2; } Accessing the private methods

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