private void AddStockIn(StockIn stockIn)
        {
            int isExecuted = 0;

            isExecuted = _stockInManager.AddtStockIn(stockIn);
            if (isExecuted > 0)
            {
                MessageBox.Show("Stock in save successfully.");
            }
            else
            {
                MessageBox.Show("Stock in save failed!");
            }
        }