private void btnAdd_Click(object sender, EventArgs e)
        {
            frm_crud = new C_operacion_crud();

            using (frm_operation_crud crud_operacion = frm_crud.formulario())
            {
                desenfoque_abrir_formulario();

                crud_operacion.btnAcept.Click += new EventHandler(read_operacion);
                crud_operacion.ShowDialog();

                overlayForm.Dispose();
            }
        }
        private void btnUpdate_Click(object sender, EventArgs e)
        {
            desenfoque_abrir_formulario();
            if (e_operacion.Clave != 0)
            {
                e_operacion.Operacion = "update";

                frm_crud = new C_operacion_crud(e_operacion);

                using (frm_operation_crud crud_operacion = frm_crud.formulario())
                {
                    crud_operacion.btnAcept.Click += new EventHandler(read_operacion);
                    crud_operacion.ShowDialog();
                }
            }
            else
            {
                c_message.message("Selecciona un registro.", C_message.message_type.warning);
            }
            overlayForm.Dispose();
        }