Where can I find examples and self-learning materials for BeginExecuteReader?

Question

SQL

The task is to write a waiting window that will be shown during the execution of long-running database queries, and from which it will be possible to kill these queries. Used .Net 4 , so without async and await . We need links to examples and materials where similar problems were solved. Or at least just examples of proper use of BeginExecuteReader() .

Answer 1

Why don't you like the example from MSDN?
msdn.microsoft.com/en-us/library/1a674khd(v=vs.110...
You can check the status of IAsyncResult not in a loop, as in the example, but in a timer, along the way displaying progress.