Thank you Henri I'm sorry to reply so late but I did'nt get the notification of your reply I will investigate because using the Combobox directly in the DGV is far better than my actual solution to set the ComboBox in a contextMenu It is not easy to find good explaination about the different way to use a combobox in a datagridview

you want a security for your [code] or for [directorys] ? if you need it for code you can use MD5 [With PHP] and you also can make a table for passwords in your database .. or you can make a firewall... good luck :-D