Fig. 8.18 in .NET

Making QR-Code in .NET Fig. 8.18

EXAMPLE 8.16
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Suppose we wish to create a two-element control array whose elements are check boxes. Let us begin with an empty form, and then add one check box in the normal manner. When the check box is first added, it will be named Check1 and its caption will also be Check1. Fig. 8.18 shows the location of Check1 within the Form Design Window. When Check1 is first created, its Index property will be unassigned. Now let us assign the value 0 to the Index property within the Properties Window, as shown in Fig. 8.19. This will result in Check1 automatically being referred to as the array element Check1(0), as shown at the top of the Properties Window (see Fig. 8.19). We then right-click on Check1 and select Copy, then right-click on the form and select Paste. Another check box, also named Check1 and having the caption Check1, will then appear in the upper left-hand corner of the Form, as shown in Fig. 8.20(a). We can then drag the new check box to its desired location, beneath the original check box, as shown in Fig. 8.20(b).
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Fig. 8.18
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Fig. 8.19
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Note that both check boxes have the same label and the same caption (Check1). However, the first check box will be referred to as Check1(0) and the second check box will be referred to as Check(1), since both check boxes are members of a control array.
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ARRAYS
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Fig. 8.20(a)
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Fig. 8.20(b)
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Another way to create a control array is to place a control in the Form Design Window in the usual manner, and then place a second control of the same type in the Form Design Window. If you rename the second control so that its name is the same as the first control, a dialog box will appear, allowing you to create a control array if you wish. Again, all of the array elements will have the same name, but a different index value. When the array elements are created in this manner, their captions will be different, unless you decide to change them so that they are all alike.
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EXAMPLE 8.17
We now extend the form developed in Example 8.16 by adding a second control array, consisting of two labels. Let us create the new control array differently, however, as described above. We begin by placing a label control in the form, as shown in Fig. 8.21(a). We then add a second form beneath it, as shown in Fig. 8.21(b). So far, the two labels are unrelated neither is an array element. We now create the desired control array be renaming the second label from Label2 to Label1. (Note that we are changing only the control name, not the caption.) Fig. 8.22 shows the Properties Window with the new name. This name change then generates the dialog box shown in Fig. 8.23. Clicking on Yes will then automatically create the array. Its two elements will be referred to as Label1(0) and Label1(1), though both elements will be named simply Label1. So far, the captions remain different. We can change the second caption to Label1 if we wish, resulting in the form shown in Fig. 8.24. Note that the renaming of the second caption from Label2 to Label1 is not required, but it is a good idea if additional control elements will be added via the copy/paste method.
Fig. 8.21(a)
Fig. 8.21(b)
ARRAYS
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Fig. 8.22
Fig. 8.23
Fig. 8.24 Once a control array has been created, an individual element (i.e., an individual control) is referred to simply by writing the array name followed by the appropriate index (subscript number), enclosed in parentheses; i.e., control array name (subscript) Similarly, a property associated with a control array element is referred to by writing the array name, followed by the appropriate index in parentheses, followed by a period and the property identifier; i.e., control array name (subscript).property
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