c# - Sql Query Notification With aggregate function SUM -


good day,

i using 1 of powerful functionality in sql sql query notification.. i' tried , works great when use aggregate function sum, got error saying **

"invoke or begin cannot called on control until window handle has been created"..

c#

private void dependency_onchange(object sender, sqlnotificationeventargs e) {      try {          uidelegate uidel = new uidelegate(refreshdata);          this.invoke(uidel, null);          sqldependency dependency = (sqldependency)sender;          dependency.onchange -= dependency_onchange; }      catch (exception r) {          messagebox.show(r.message);      }  }

what know error came query uses aggregate function sum that's why .

how use aggregate function sum in sql query notification ? here query form kindly check .. 100% sure problem in query.. please help.. thank :)

sql

select sales_order.sales_order_id [sales order id],        customer.customer_name     [customer name],        sales_order.orderdate,        sales_order.orderstatus    [status],        sum(orderline.amount)      [total amount]   dbo.sales_order        inner join dbo.customer          on dbo.customer.customer_id = dbo.sales_order.customer_id        inner join dbo.orderline          on dbo.orderline.sales_order_id = dbo.sales_order.sales_order_id  dbo.sales_order.orderstatus = 'pending'         or dbo.sales_order.orderstatus = 'completed'         or dbo.sales_order.orderstatus = 'provisioning'            , dbo.orderline.orderlinestatus = 'pending'         or dbo.orderline.orderlinestatus = 'completed'         or dbo.orderline.orderlinestatus = 'provisioning' group  dbo.sales_order.sales_order_id,           dbo.customer.customer_name,           dbo.sales_order.orderdate,           dbo.sales_order.orderstatus order  [sales order id] desc


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