private void AddBtn_Click(object sender, EventArgs e)
{
ApplicationManager.addItem(ItemID.Text, ItemName.Text, Cost.Text, CompanyID.Text, DateTime.Now.ToString());
ApplicationManager.updateStock(ItemID.Text, Quantity.Text);
ApplicationManager.setItemPriceManagement(ItemID.Text, RetailerProfitPrice.Text, WholeSallerProfitPrice.Text);
ApplicationManager.showStock(ApplicationManager.getDataGridViewFromInventoryStoreForm());
ItemID.Text = "ItemID";
ItemName.Text = "ItemName";
Cost.Text = "Cost";
CompanyID.Text = "CompanyID";
Quantity.Text = "Quantity";
RetailerProfitPrice.Text = "RetailerProfitPrice";
WholeSallerProfitPrice.Text = "WholeSallerProfitPrice";
}