How to sum and remove duplicates on 2 columns - excel

Question

Application Match for one column works but for 2 columns is giving me error
With Sht
LastRow = .Cells(.Rows.Count, "J").End(xlUp).Row
For i = LastRow To 2 Step -1
DupRow = Application.Match(Cells(i, 9).Value, Range(Cells(1, 9), Cells(i - 1, 9)), 0)
DoEvents
If Not IsError(DupRow) Then
Cells(i, 8).Value = Cells(i, 8).Value + Cells(DupRow, 8).Value
Cells(i, 9).Value = Cells(i, 9).Value + Cells(DupRow, 9).Value
Rows(DupRow).Delete
End If
Next i
End With
for 2 columns Error runtime 1004
DupRow = Application.Match(Cells(i, 4).Value & Cells(i, 5).Value, Range(Cells(1, 4) & Cells(1, 5), Cells(i - 1, 4) & Cells(i - 1, 5)), 0)
What is the correct way of doing this?

Answer 1

In my opinion it's better to use dictionary for that, which has built-in method for managing keys, so it can be used to get unique values:
Sub teest()
Dim val As String
Set dict = CreateObject("Scripting.Dictionary")
LastRow = Cells(Rows.Count, "A").End(xlUp).Row
For i = LastRow To 2 Step -1
val = Cells(i, 1).Value & Cells(i, 2).Value
If dict.Exists(val) Then
Rows(i).Delete
Else
dict.Add val, 0
End If
Next
End Sub