in access while working with form;

in the field where the null value is not allow; I can catch the error message by handling the OnError of that form who give me the DataErr and Response As integer

by doing: response = true I can disappear the system message (the same message when I try to enter invalid data directly to the table) who comes after the sub OnError and who has the control’s name, who cause the problem;

but I can’t handle the name of that control, in order to set focus to that control and lead the user directly to enter this value.