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"; } } }