protected void ClearButton1_Click(object sender, EventArgs e) { var username = User.Identity.Name; SecurityController securitymgr = new SecurityController(); int?employeeid = securitymgr.GetCurrentUserEmployeeId(username); EmployeeController sysmgrs = new EmployeeController(); Employee info = sysmgrs.Employee_Get(employeeid.Value); int employeeID = info.EmployeeID; MessageUserControl.TryRun(() => { ShoppingCartController sysmgr = new ShoppingCartController(); sysmgr.ClearButton_Shopping(employeeID); List <ShoppingCart> datainfo = sysmgr.ShoppingCart_OrderList(); CartSalesGridView.DataSource = datainfo; AddButtonn.Enabled = true; //InvoiceIDText.Text = null; //InvoiceIDText.Visible = false; CartSalesGridView.Enabled = true; CartSalesGridView.DataBind(); QuantityTextBox.Text = "1"; PanelInvoice.Visible = false; CategoryDDL.Enabled = true; ProductDDL.Enabled = true; }, "Empty", "Shopping Cart is Empty Now"); }