protected void saveButton_Click(object sender, EventArgs e)
        {
            outputLabel.Text = null;
            string tempStockOutQuantity = stockOutTextBox.Text;
            int    tempCompanyId        = Convert.ToInt32(companyDropDownList.SelectedValue);
            int    tempItemId           = Convert.ToInt32(itemDropDownList.SelectedValue);

            outputLabel.Text = stockOutManager.SetValidation(tempStockOutQuantity, tempCompanyId, tempItemId);
            if (stockOutManager.PassValidation())
            {
                if (ViewState["stockOutListVS"] == null)
                {
                    StockOut stockOut = new StockOut();

                    stockOut.CompanyId        = Convert.ToInt32(companyDropDownList.SelectedValue);
                    stockOut.CompanyName      = companyDropDownList.SelectedItem.Text;
                    stockOut.ItemName         = itemDropDownList.SelectedItem.Text;
                    stockOut.ItemId           = Convert.ToInt32(itemDropDownList.SelectedValue);
                    stockOut.StockOutQuantity = Convert.ToInt32(stockOutTextBox.Text);
                    int tempStockOut = stockOut.StockOutQuantity;
                    int checkVS      = 0;
                    checkVS = stockOutManager.CheckBefore(tempStockOut, stockOut.ItemName, stockOut.CompanyId);
                    if (checkVS > 0)
                    {
                        outputLabel.Text = "Quantity of " + stockOut.ItemName + " is insufficent";
                    }
                    else
                    {
                        List <StockOut> stockOutList = new List <StockOut>();
                        stockOutList.Add(stockOut);
                        ViewState["stockOutListVS"] = stockOutList;
                    }
                }
                else
                {
                    List <StockOut> stockOut    = (List <StockOut>)ViewState["stockOutListVS"];
                    StockOut        newStockOut = new StockOut();
                    int             check       = 0;
                    newStockOut.CompanyName      = companyDropDownList.SelectedItem.Text;
                    newStockOut.CompanyId        = Convert.ToInt32(companyDropDownList.SelectedValue);
                    newStockOut.ItemName         = itemDropDownList.SelectedItem.Text;
                    newStockOut.ItemId           = Convert.ToInt32(itemDropDownList.SelectedValue);
                    newStockOut.StockOutQuantity = Convert.ToInt32(stockOutTextBox.Text);
                    foreach (StockOut aStockOut in stockOut)
                    {
                        if (aStockOut.CompanyName == newStockOut.CompanyName && aStockOut.ItemName == newStockOut.ItemName)
                        {
                            check = 1;

                            int q = aStockOut.StockOutQuantity;

                            int tempStockOut = q + newStockOut.StockOutQuantity;
                            int checkVS      = 0;
                            checkVS = stockOutManager.CheckBefore(tempStockOut, aStockOut.ItemName, aStockOut.CompanyId);
                            if (checkVS > 0)
                            {
                                outputLabel.Text = "Quantity of " + aStockOut.ItemName + " is insufficent";
                            }
                            else
                            {
                                aStockOut.StockOutQuantity   = q + newStockOut.StockOutQuantity;
                                newStockOut.StockOutQuantity = aStockOut.StockOutQuantity;
                            }
                        }
                    }
                    if (check == 0)
                    {
                        int tempStockOut = newStockOut.StockOutQuantity;
                        int checkVS      = 0;
                        checkVS = stockOutManager.CheckBefore(tempStockOut, newStockOut.ItemName, newStockOut.CompanyId);
                        if (checkVS > 0)
                        {
                            outputLabel.Text = "Quantity of " + newStockOut.ItemName + " is insufficent";
                        }
                        else
                        {
                            stockOut.Add(newStockOut);
                            ViewState["stockOutListVS"] = stockOut;
                        }
                    }
                }
            }


            List <StockOut> aNewstockOut = (List <StockOut>)ViewState["stockOutListVS"];

            stockOutGridView.DataSource = (List <StockOut>)ViewState["stockOutListVS"];
            stockOutGridView.DataBind();
        }