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Public Function ConcatenateRange(pRange As Range, Optional pDelimiter As String = " ") As String
ConcatenateRange = Join(WorksheetFunction.Transpose(pRange.Value), pDelimiter)
End Function
Sub TestMe()
Dim r As Range
Set r = ThisWorkbook.Worksheets(1).Range("A1:A10")
MsgBox ConcatenateRange(r)
End Sub
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With Sheet1
Set rng1 = .Range("A1:A3")
Set rng2 = .Range("C1:C3")
'This combines the two separate ranges, so select A1, A2, A3, C1, C2, C3
set newRng = Union(rng1, rng2)
'This combines the two ranges in the same way as when using "A1:C3",
'so including the cells from column B
set newRng = .Range(rng1, rng2)