In Excel VBA, we need to find out last row number (how many rows / data tables's rows count) to scroll down or other operations.
For example start from B2 to the last row in B column.
Sheets("FC").Range("b2").End(xlDown).Row
or
Sheets(1).Range("b2").End(xlDown).Row
Example: Read all row in the column and add to combo box.
For line= 2 To wb1.Sheets(1).Range("b2").End(xlDown).Row
ThisWorkbook.Sheets("Sheet1").ComboBox1.AddItem wb1.Sheets(1).Cells(satir, 2).Value
Next