Determining a Worksheet's Number

Lawrence needs a way to determine the number of a worksheet even if the worksheet has been renamed. For instance, if a worksheet is named Sheet11 it is easy enough to figure out that it is sheet 11. If he renames the sheet to January, Lawrence still needs a way to know this is sheet 11.

The solution to this problem is best done with a user-defined function (a macro). There are, in reality, two numbers that the macro could return for each worksheet. The first is the index number for the worksheet. This number represents the index of the worksheet within the worksheets collection for the workbook. This value can be returned by a macro similar to the following:

Function SheetNumber1(shtname As String)
    Dim sht As Worksheet

    Application.Volatile
    For Each sht In ThisWorkbook.Worksheets
         If LCase(sht.Name) = LCase(shtname) Then
              SheetNumber1 = sht.Index
              Exit Function
         End If
    Next
    SheetNumber1 = -1
End Function

This function, when used in a worksheet, will return the index number of any worksheet whose name is passed to the function. If the name that is passed to the function doesn't exist in the worksheets collection, then a value of -1 is returned by the function. For instance, the following used in a cell would return the index value for the worksheet within the collection:

=SheetNumber("January")

The problem with this approach is that the order of worksheets in the worksheets collection can change over time. Thus, you can't always assume that the eleventh sheet in the collection is the sheet that was originally Sheet11.

A more consistent way of figuring out the original name for a worksheet (regardless of how it is renamed) is to use what Visual Basic refers to as the sheet's "CodeName." This is a property of the worksheet and can be determined in the following manner:

Function SheetNumber2(shtname As String)
    Dim sht As Worksheet
    Dim sTemp As String

    Application.Volatile
    For Each sht In ThisWorkbook.Worksheets
         If LCase(sht.Name) = LCase(shtname) Then
              sTemp = sht.CodeName
              SheetNumber2 = Val(Mid(sTemp, 6, 4))
              Exit Function
         End If
    Next
    SheetNumber2 = -1
End Function

The CodeName property is read-only in a macro. It is assigned at the time that the worksheet is created, but it is possible for it to be manually changed within the Visual Basic editor. The CodeName is always a string, representing the very first name that was applied to the worksheet, so it will be something like "Sheet11". Once the CodeName is set, even if the worksheet is renamed (such as to "January"), it will remain stable ("Sheet11").

In the macro example (SheetNumber2) the CodeName property is assigned to the sTemp variable. This will, most of the time, be something like "Sheet3" or "Sheet11". So, the macro then grabs the numeric value of whatever begins with the sixth character (right after "Sheet"). This is the value that is returned by the function.