Answer / zafar mohammed ameem

Callbacks are usually the methods which should be invoked
after execution of some method.
Asynchronous Call back is a way of invoking a method
Asynchronously (on a different thread). But before
invocation of method we provide a callback delegate which
refers to the method which should be called after execution
of async method. This method is called call back method.
AsyncCall backs are useful when user intends to execute any
method asynchronously and notify some thing after method is
finshed, without modifying the signature of the method
being called.

Answer / uma`

client has to wait untill the method that completes current
process.by using delegates we call the asynchronous calls

Answer / hrdiya

Page processing begins on a thread-pool thread, but that
thread is returned to the thread pool once an asynchronous
I/O operation begins in response to a signal from ASP.NET.
When the operation completes, ASP.NET grabs another thread
from the thread pool and finishes processing the request.
Scalability increases because thread-pool threads are used
more efficiently. Threads that would otherwise be stuck
waiting for I/O to complete can now be used to service
other requests. The direct beneficiaries are requests that
don't perform lengthy I/O operations and can therefore get
in and out of the pipeline quickly. Long waits to get into
the pipeline have a disproportionately negative impact on
the performance of such requests.

Answer / rakesh

call multiple threads at a time

Answer / saami solutions

when a synchronous call is made, the calling thread is
blocked until the method completes whereas an asynchronous
call is made on a different thread, and this allows the
original thread to continue its work while the asynchronous
call is in progress.

Answer / neeta

* Asynchronous callbacks means that a call is made from a Main Program to a .net class's method and the program continues execution.
* when the callback is made (Means the method has finished it work and returns value) ,the Main Program handles it.

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