In ASP.NET asynchronous pages, is it possible to execute 2 sequential, asynchronous tasks?

In ASP.NET, you can run asynchronous tasks as follows:

PageAsyncTask task1 = 
new PageAsyncTask(BeginAsyncOperation1, EndAsyncOperation1, TimeoutAsyncOperation1, state);
RegisterAsyncTask(task1);

PageAsyncTask task2 =
ne开发者_如何学运维w PageAsyncTask(BeginAsyncOperation2, EndAsyncOperation2, TimeoutAsyncOperation2, state);
RegisterAsyncTask(task2);

However, suppose you need to ensure that task1 completes before task2 executes. Is this possible?

My understanding is that these tasks would run in parallel.

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The easiest solution would be to launch task2 within the "EndAsyncOperation1" handler.

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If task1 needs to complete before task2, you could consider creating a third operation that encapsulates synchronous calls to BeginAsyncOperation1 and BeginAsyncOperation2 and run that operation asynchronously. The work for the second task will not begin until the first task has completed.

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The solution is in the PageAsyncTask constructor. Set the boolean flag for "parallel" to be false and they will run sequentially.