private void addButton_Click(object sender, EventArgs e)
        {
            var userDialog = new UserDialog(DialogState.Add);

            userDialog.ShowDialog();
            updateTable();
        }
        private void editButton_Click(object sender, EventArgs e)
        {
            var selectedId = GetSelectedIdFromTable(grid);
            var userDialog = new UserDialog(DialogState.Edit, selectedId);

            userDialog.ShowDialog();
            updateTable();
        }