Find last row of Table

I want to read a excel from row 12 to row 52. Row 52 and total is not in fixed position.
so how can i get the last row of table. Cus i want to add some rows below the last row of table.
Table.xlsx (12.9 KB)

have a look on this acitivity

Adding data on existing data we would use append Range activity

if calculation is to be done datatable base we use YourDataTableVar.Rows.Count for calulating the excel index as following:
Last Excel index number = YourDataTableVar.Rows.Count + Offset
Offset = 0 when AddHeaders is not used
Offset = 1 when AddHeaders is used