>Hello Naomy
>
>Your Question is :
>Do you want to calculate totals for the whole grid or put totals in an extra column of the grid?
>
>i want to calculate , no on any column in my Grid but on a textbox in my form the value of the column , for example : €totalinvoice , where the grid column checkbox is true.
>
>for example
>Columns on my grid : Check , nº invoice , totalinvoice
>

>check           nº invoice      totalinvoice
>.T.             11111               1000,00
>.T.             22222                500,00
>.F.              3333                100,00

>
>my textbox total on my form outside the grid is equal to : (1000,00+500,00)=1500
>
>Thanks, i hope you understand better now.
>
>Luis Santos

Sure, it's much better now.

select MyTable
sum TotalInvoice to lnTotal for Check = .t.
thisform.txtTotal.value = m.lnTotal