Cells.Rows.End(xlUp).Count - Insted Of - UsedRange.Rows.Count

I used Sheets(1).Cells(1, 1).Rows.End(xlUp).Count instead of UsedRange.Rows.Count in this code , but it didn't succed with me. Why and how to do that



Dim i As Long, j As Long
j = 1
For i = 1 To UsedRange.Rows.Count
Sheets(2).Cells(j, "a").Value = Sheets(1).Cells(i, "a").Value
Sheets(2).Cells(j, "b").Value = Sheets(1).Cells(i, "b").Value
Sheets(2).Cells(j, "c").Value = Sheets(1).Cells(i, "c").Value
j = j + 1
Next i
End Sub