Write #n, data items in .NET framework

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Write #n, data items
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This statement causes the data items to be separated by commas. In addition, each string item will be enclosed in quotation marks. The following example illustrates the use of the Write #n statement.
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EXAMPLE 9.4 CREATING A SEQUENTIAL DATA FILE: DAILY HIGH TEMPERATURES
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We now develop a Visual Basic program that accepts information from the keyboard via a series of input boxes, and writes the information to a sequential text file. We will use the program to enter the following list of daily high temperatures for a typical summer week in Pittsburgh, Pennsylvania. Day High Temperature, F Sunday 77 Monday 76 Tuesday 81 Wednesday 87 Thursday 84 Friday 79 Saturday 74 We begin with the preliminary control layout shown in Fig. 9.13. The File menu contains the entries New and Exit, as shown in Fig. 9.14.
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Fig. 9.13
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Fig. 9.14
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DATA FILES
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Here are the corresponding menu editor entries. Caption
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File ....&New ........&Exit
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Name
mnuFile mnuNew mnuSep1 mnuExit
The associated event procedures are shown below.
Private Sub Form_Load() Form1.Caption = "Creating a Data File" Label1.Caption = "Daily Temperatures" Label1.FontSize = 12 Label1.Alignment = 2 'center text End Sub Private Sub mnuNew_Click() Dim NewFile As String, Day As String Dim HiTemp As Single CommonDialog1.CancelError = True On Error GoTo CancelButton CommonDialog1.Filter = "Text file (*.txt) |*.txt" CommonDialog1.ShowSave NewFile = CommonDialog1.FileName Open NewFile For Output As #1 Day = InputBox("Please enter the day of the week _ (type END when finished):", "Day") Do While UCase(Day) <> "END" HiTemp = Val(InputBox("Please enter the high temperature:", "High Temp")) Write #1, Day, HiTemp Day = InputBox("Please enter the day of the week _ (type END when finished):", "Day") Loop Close #1 CancelButton: Exit Sub End Sub Private Sub mnuExit_Click() End End Sub
Event procedure mnuNew_Click uses the SaveAs dialog box to name the output file. A Do While loop is used to enter the data and save it to the output file. Two input boxes, one for the day of the week and the other for the daily high temperature, are generated for each day. The looping action continues until the user enters the string End (in either upper- or lowercase) when prompted for the day. Notice that the first weekday is entered before entering the loop, so that the logical condition within the Do While statement can be evaluated during the first pass through the loop. Once a string representing the day and a value for the high temperature have been entered, the information is written to the output file via the Write #n statement. Each day s information is written on a separate line in the output file.
DATA FILES
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When the program is executed, the form shown in Fig. 9.15 first appears. We then select New from the File menu, as shown in Fig. 9.16. This results in the SaveAs dialog box, shown in Fig. 9.17. (Note that the purpose of the SaveAs dialog box in this application is simply to provide a file name.)
Fig. 9.15
Fig. 9.16
Fig. 9.17
Once a file name has been provided a pair of dialog boxes appears, prompting for the day, as shown in Fig. 9.18, and the corresponding daily high temperature, as shown in Fig. 9.19. This process continues until the user enters End as the day of the week, as shown in Fig. 9.20. The program execution is then terminated by selecting Exit from the File menu.
Fig. 9.18
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DATA FILES
Fig. 9.19
After the program execution has been completed, a sequential text file called Daily Temperatures.txt will have been created. The contents of this text file are shown below. Note that the final string, End, is not included in the text file.
"Sunday",77 "Monday",76 "Tuesday",81 "Wednesday",87 "Thursday",84 "Friday",79 "Saturday",74
A program that creates a new text file can easily be altered so that it also appends additional information to an existing text file. To do so, simply open an existing text file as an Append file; then proceed as you would if you were creating a new text file. The following example illustrates the technique.
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