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'INPUT         : Sheet, the worksheet we'll search to find the last column
'              : RowNum, the row (as a number) we're interested in
'OUTPUT        : Long, the last occupied column in the specified row
'SPECIAL CASE  : if a bad row number is entered (anything < 1), return 0
'EXAMPLES BELOW:
'
'assume that on MySheet, cells A1:F1 are occupied,
'but B3 is the only occupied cell in row 3
'LastColNumInRow(MySheet, 3)
'>> 2
'
'assume that EmptySheet is totally empty
'LastColNumInRow(EmptySheet, 1)
'>> 1
'
'assume that you mistakely pass in -1 for the row number on MySheet
'LastColNumInRow(MySheet, -1)
'>> 0
'
Public Function LastColNumInRow(Sheet As Worksheet, RowNum As Long) As Long
    If RowNum < 1 Then
        LastColNumInRow = 0
        Exit Function
    End If
    With Sheet
        LastColNumInRow = Cells(RowNum, .Columns.Count).End(xlToLeft).Column
    End With
End Function