private void comboBoxStockOutItem_SelectedIndexChanged(object sender, EventArgs e)
{
item.ItemName = comboBoxStockOutItem.Text;
textBoxStockOutReorder.Text = _itemManager.ReorderLavel(item).ToString();
stockOut.ItemID = _itemManager.ItemId(item);
stockIn.StockAvailableQuentity = _itemManager.Quentity(item);
textBoxStockOutQuentity.Text = _itemManager.AvailableQuentity(item).ToString();
stockIn.StockInID = _stockInManager.GetID(item);
}