VBA 2 IF conditions applied for column - vba

Question

this is my first post, please be patient if I'm doing/asking something wrong.
My issue is:
I got 2 columns, A is number of children, B is name of those children.
Those values are manually entered, I simply would like to have B mandatory if A is filled.
Here is what I thought:
Private Sub Workbook_BeforeClose(Cancel As Boolean)
If Not IsEmpty(Sheet1.Range("A1")) Then
If IsEmpty(Sheet1.Range("B1")) Then
MsgBox "Please fill in cell B1 before closing."
Cancel = True
Else '
End If
End If
End Sub
This is actually working perfectly, unfortunately I can't manage to extend it for whole columns, when replacing A1 with A1:A1000 and B1 with B1:B1000 for instance,it doesn't work.
How can I validate this for both entire column A and B?
thanks in advance!

Answer 1

Try this
Private Sub Workbook_BeforeClose(Cancel As Boolean)
Cancel = Evaluate("SUMPRODUCT(--(ISBLANK(Sheet1!B:B) <> ISBLANK(Sheet1!A:A)))")
If Cancel Then MsgBox "Please fill in column B before closing."
End Sub
EDIT
In order to take the user to the place where data is missing, and taking into account the additional information you provided about your data, try this:
'Private Sub Workbook_BeforeClose(Cancel As Boolean)
Private Sub Workbook_BeforeSave(ByVal SaveAsUI As Boolean, Cancel As Boolean)
Dim r: r = Evaluate( _
"MATCH(FALSE, ISBLANK('ELENCO AGGIORNATO'!V:V) = ISBLANK('ELENCO AGGIORNATO'!W:W), 0)")
If IsError(r) Then Exit Sub ' All is fine
Cancel = True
Application.Goto Sheets("ELENCO AGGIORNATO").Cells(r, "V").Resize(, 2)
msgBox "Please fill missing data before saving."
End Sub
Also note that I recommend Workbook_BeforeSave instead of Workbook_BeforeClose, because there's no harm if the user decides to drop his (incomplete) work and close the workbook without saving.

Answer 2

You may try something like this...
Private Sub Workbook_BeforeClose(Cancel As Boolean)
Dim str As String
Dim Rng As Range, Cell As Range
Dim FoundBlank As Boolean
Set Rng = Sheet1.Range("A1:A1000")
str = "Please fill the cells listed below before colsing..." & vbNewLine & vbNewLine
For Each Cell In Rng
If Cell <> "" And Cell.Offset(0, 1) = "" Then
FoundBlank = True
str = str & Cell.Address(0, 1) & vbNewLine
End If
Next Cell
If FoundBlank Then
Cancel = True
MsgBox str, vbExclamation, "List of Blank Cells Found!"
End If
End Sub