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Excel provides several tools you can use to modify the number and identification of worksheets in a workbook ADD A WORKSHEET Right-click the worksheet tab to the right of where you want the new worksheet, click Insert, and click OK Or On the worksheet bar, click Insert Worksheet A new worksheet is added to the right of any current tabs

Sub Test_Error() On Error GoTo err_handler temp = Dir("d:\**") Exit Sub err_handler: MsgBox "The D drive is not ready" & " End Sub

You can divide the Excel worksheet area so that you can view worksheets from multiple workbooks This arrangement makes it easy to copy data, formulas, and formatting among several worksheets

example of tiling four workbooks)

The first line sets up a routine to jump to when an error occurs using the On Error statement It points to err_handler, which is a label just below the Exit Sub line further down that will deal with any error condition The purpose of a label is to define a section of your code that you can jump to by using a GoTo statement The line to read the D drive is the same as before, and then there is an Exit Sub line, because if all is well you do not want the code continuing into the err_handler routine If an error happens at any point after the On Error line, the code execution jumps to err_handler and displays a message box that says drive D is not ready However, you may have noticed that the code execution jumps to err_handler when any error occurs, not just the drive not ready error An error could occur because you made a mistake typing in this code Fortunately, you can interrogate the error to find out what went wrong You can also use the Err object to give the description of the error and concatenate it into your message so it also says Drive not ready You do this using the Err function This will return the number associated with the runtime error that happened You can add this into the previous example as follows:

Right-click the worksheet tab of the worksheet you want to delete, and click Delete MOVE OR COPY A WORKSHEET You can move or copy worksheets within a workbook

Let s take a look at the code in Figure 11 3 in detail. In the beginning of our code, we set our counter to the value of 0. Even though we have five programs, they will be represented by the counter values 0 through 4. Since we are using a loop to rotate through the programs, we could use the counter value that is included with the Loop block, but later, when we build on to the program, having the Counter variable will be more useful.

or between open workbooks by dragging a worksheet s tab (See View Worksheets from Multiple Workbooks for steps to arrange multiple open workbooks to facilitate dragging objects between them)

Sub Test_Error() On Error GoTo err_handler temp = Dir("d:\**") Exit Sub err_handler:

Figure 6-19: You can look at several workbooks at the same time to compare them or to transfer information among them

157 157

If ErrNumber = 71 Then MsgBox "The D drive is not ready" Else MsgBox "An error occurred" End If End Sub

in its upper-right corner Return selecting a worksheet to close and clicking the a worksheet to full view in the Excel window by double-clicking its title bar

You saw from the first example that the number for Drive not ready came up in the error message box as 71 The program looks at Err (a system variable that holds the last error number) and checks to see if it is 71 If it is, it displays the message box, The D drive is not ready ; if it is not, it displays the message box, An error occurred

If you have only two workbooks open, they will appear next to one another If you have more than two workbooks open, you can select the workbook to view along with the currently active workbook from the Compare Side By Side dialog box