barcode print in asp net VISUAL BASIC CONTROL FUNDAMENTALS in .NET

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VISUAL BASIC CONTROL FUNDAMENTALS
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where string represents the error message, in the form of a string (either a string constant or a string variable) that is provided by the programmer. When the error message is encountered, it will generate a message such as that shown in Fig. 4.33. The message disappears when the user clicks on Ok.
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Fig. 4.33 A typical error message The MsgBox function also allows other display options, including multiple command buttons and a provision for subsequent action that is dependent on the selection of a command button (see Sec. 5.7).
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EXAMPLE 4.11 CALCULATING FACTORIALS
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The factorial of n is defined as n! = 1 2 3 . . . n. Thus, 2! = 1 2 = 2; 3! = 1 2 3 = 6; 4! = 1 2 3 4 = 24; and so on. Note that n must be a positive integer. Also, note that n! may be a very large number, even for modest values of n (for example, 10! = 3,628,800). Factorials are used in certain mathematical applications, such as determining how many different ways n objects can be arranged. A factorial can easily be calculated using a loop structure. For example, in Visual Basic, we can write
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Dim Factorial As Long, i As Integer, n As Integer Factorial = 1 For i = 1 To n Factorial = Factorial * i Next i
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This segment of code assumes that the value of n is known. While progressing through the loop, the value of i will increase from 1 to n. Thus, when first entering the loop, Factorial will have a value of 1. After the first pass, Factorial will again have a value of 1. After the second pass, Factorial = 1 2 = 2; after the third pass, Factorial = 1 2 3 = 6; and so on, until Factorial = 1 2 3 = . . . n = n! after the last pass. Now let us build a Visual Basic program that will calculate the factorial of a given positive integer, n. We will include an error trap for non-positive values of n. The initial layout of the Form Design Window is shown in Fig 4.34.
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Fig. 4.34
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To customize this window, we assign the following initial values to the control properties: Object Form1 Label1 Label2 Label3 Text1 Text2 Command1 Command2 Command3 Property Caption Caption Font Caption Font Caption Font Text Font Text Font Caption Font Caption Font Caption Font Value Factorials Calculate the factorial of n MS Sans Serif, 12-point n = MS Sans Serif, 10-point n! = MS Sans Serif, 10-point (blank) MS Sans Serif, 10-point (blank) MS Sans Serif, 10-point Go MS Sans Serif, 10-point Clear MS Sans Serif, 10-point Quit MS Sans Serif, 10-point
Here are the event procedures corresponding to the command buttons.
Private Sub Command1_Click()
Dim Factorial As Long, i As Integer, n As Integer n = Val(Text1.Text) If n < 1 Then Beep MsgBox ("ERROR - Please try again") Else Factorial = 1 For i = 1 To n Factorial = Factorial * i Next i Text2.Text = Str(Factorial) End If End Sub Private Sub Command2_Click() Text1.Text = "" Text2.Text = "" End Sub Private Sub Command3_Click() End End Sub
Note that the value of n is entered in the first text box and then converted to an integer. We then encounter an error trap in the form of an If-Then-Else block, to determine if n is a positive integer, as required. If n is not a positive integer, the com-
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VISUAL BASIC CONTROL FUNDAMENTALS
puter will beep and generate the message ERROR Please try again. However, if n is a positive integer, the computer enters a loop to determine the value of n!, using the logic described on the previous page. The value of n! is then converted to a string and displayed in the second text box. When the program is first executed, the screen appears as shown in Fig. 4.35. The user may then enter a value for n in the first text box and click on the Go button. If the value of n is a positive integer, the corresponding value of n! will be displayed, as shown in Fig. 4.36. If the value entered for n is not a positive integer, an error message will be generated, as shown in Fig. 4.37. Clicking on the Clear button will restore the display to that shown in Fig. 4.35. Similarly, clicking on the Quit button will terminate the computation.
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