I'm using Access, and I have already checked the size of all fields and format also directly from the bank and also in vb.net itself.
"insert into aplicacao (codigo, convenio, descricao , valconv, ativo, usuario, maquina, data_registro, flag)
VALUES
(@codigo, @convenio, @descricao , @valconv, @ativo, @usuario, @maquina, @data_registro, @flag)"