Combo1.Tag = i in VS .NET

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Combo1.Tag = i
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causes the current value of the index i to be assigned to the tag property. After the last pass through the loop, Combo1.tag will then represent the number of data items read from the file. The two disabled menu items, Save As and Print, are enabled near the end of the procedure. This is followed by the Close statement, which closes the open text file. The mnuSaveAs_Click and mnuPrint_Click procedures are similar. Note, however, that each of these procedures includes a For To-Next loop, in which the number of passes is known in advance. The value of Combo1.tag, assigned in mnuOpen_Click, provides the number of passes through each loop. When the program is executed, we first see the form shown in Fig. 9.9. We can then select either Open or Exit from the drop-down menu, as shown in Fig. 9.10.
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Fig. 9.9
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Fig. 9.10
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Now suppose we select Open from the drop-down menu, resulting in an Open dialog box similar to that shown in Fig. 9.4. Suppose we then select the data file Sample.txt, containing the following information.
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The number of data items read from the file and the content of the data items will depend on the manner in which the data items are written within the text file. If the data items are entered exactly as shown above, then each complete line of information will be entered as a single data item, as shown in Fig. 9.11. The reason for this is the absence of commas separating the individual data items within the text file. Thus, if we alter the data file so that it appears as
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CHAP. 9]
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DATA FILES
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then each individual data item within the data file will be read into the computer separately, as shown in Fig. 9.12. This is the result that is most likely to be desired when reading simple data items (i.e., numeric constants and/or strings not containing any commas or blank spaces).
Fig. 9.11
Placing quotes around the individual data items, i.e.,
"red" "white" "blue" "green" "yellow" "black" "123" "456" "789"
Fig. 9.12
will produce the same results as those shown in Fig. 9.12, thus replacing the need for commas as separators. Furthermore, commas and quotes may be combined; i.e.,
"red", "white", "blue" "green", "yellow", "black" "123", "456", "789"
though the results will still be the same as those shown in Fig. 9.12.
Until now, we have focused on entering data from a text file via the Input #n statement, and writing data to a text file via the Print #n statement. However, there are other ways to enter and write data that are convenient in certain situations. For example, the Line Input statement; i.e.
Line Input #n data item
enters an entire line of text as a single data item. Any commas or quotation marks that are included as separate data item delimiters are simply entered as a part of the text, along with everything else. The Input library function is also useful under certain conditions. This function returns a specified number of bytes from a given data channel. The function is written in general terms as
Input(number of bytes, #n)
When combined with the LOF (length-of-file) library function, the Input function can be used to read an entire text file as a single data item, as shown in the following example.
DATA FILES
[CHAP. 9
EXAMPLE 9.3
Suppose we have opened an input text file on data channel #1. Then the following assignment statement will cause the contents of the entire data file to be assigned to the string variable Message.
Dim Message As String . . . . . Message = Input(LOF(1), #1)
When writing data to a text file, we may wish to use the Write #n statement rather than the Print #n statement. This statement is very useful when generating a text file from information entered from the keyboard. The Write #n statement is written in general terms as
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