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