Invoke or call more than one method at same time?

Question

how to call more than one method at same time in my page load in asp.net?? i have 4 methods to called in my page load event. but i want to call all 4 methods and not wait for 1st method to get finish then call 2nd method.

How to achieve this is in asp.net 4.0?

Answer 1

First off, it is important to know if what you are doing is sensible. If they are all CPU-bound, then do not do this, IMO; a web server is already highly threaded, and is usually a busy place to begin with. Chances are high that you will slow the whole thing down by using multiple cores. It'll look great for 1 user, though!

If you are IO-bound, then there are any number of ways to do this; the preferred would be to use the inbuilt async methods of whatever you are talking to, so you can use IOCP rather than regular threads. So for a NetworkStream, you would use BeginRead(...) etc.

Then you need to join everything together. Lots more ways; personally I tend to use Monitor.Wait and Monitor.Pulse, as this avoids going to unmanaged code (many wait-handles are actually OS-provided).

Also note: threading/parallelism comes in a bundle alongside many fun ways to fail; normally you only need to worry overly about static methods/data for synchronization, but if you have multiple threads in a single request doing things: watch out for bumps... there are many.

The next version of .NET is meant to make continuations a lot easier; I need to take a look to see how easily we can apply the current experimental code to IOCP scenarios.

Answer 2

Task[] tasks = new Task[]
{
   new Task(Method0),
   new Task(Method1),
   new Task(Method2),
   new Task(Method3)
}

foreach(var task in tasks)
   task.Start();

Or more shortly

new Task(Method0).Start();
new Task(Method1).Start();
new Task(Method2).Start();
new Task(Method3).Start();