Get the most updated selecetd items in form of a delimited string.
Dim ret as string = GD.Get_SelectedItem(Unit)
A delimited string holding the most updated selecetd items in the format of - ^1 Macro1 ^2 Qty1 ^1 Macro2 ^2 Qty2 ^1 (where ^1=chr(1) and ^2 = chr(2)). Do not use this string directly as it'll be parsed into the dbSelectedItem Method. Use this information to determine whether there is any thing selected.