protected void viewSalesSearchButton_Click(object sender, EventArgs e)
        {
            if (Validation())
            {
                DateTime from = Convert.ToDateTime(fromDateTextBox.Text.Trim());
                DateTime to   = Convert.ToDateTime(toDateTextBox.Text.Trim());

                if (from <= to)
                {
                    List <StockOutVM> aStockOuts = new List <StockOutVM>();
                    aStockOuts = aStockOutManager.GetAllItemBetweenTwoDate(from, to);
                    if (aStockOuts.Count == 0)
                    {
                        messageLabel.Text = "No item found";
                        salesSummaryGridView.DataSource = null;
                        salesSummaryGridView.DataBind();
                    }
                    else
                    {
                        salesSummaryGridView.DataSource = aStockOuts;
                        salesSummaryGridView.DataBind();
                    }
                }


                else
                {
                    salesSummaryGridView.DataSource = null;
                    salesSummaryGridView.DataBind();
                    messageLabel.Text = "From Date must be equal or smaller than To Date";
                }
            }
        }