ASP.NET 2.0 Async Webservice Calls?

[beefeater267]

Hi,

I have a VS.NET 2003 project that I am converting to .NET 2.0 / VS.NET 2005. So, basically I have a web service and a web app that consumes the service. So, from VS.NET 2003, I could make calls like:

webService.BeginFoo and webService.EndFoo

But, when I began porting over my code, I noticed that things have changed and that there is no longer Begin.. and End... functions, but rather FooAsync and event handlers.

So, I modified my code to call the FooAsync and wired up a ...Completed event handler to the web service object. However, now I am getting runtime errors like:

Async call is not valid in this context...... add AddOnPreRenderCompleteAsync, etc.... something like that.... So, I tried to add the call such as:

AddOnPreRenderCompleteAsync(new BeginEventHandler(...), new EndEventHandler(...))

But, i don't exactly know what to put in the (...) places. It looks for a function like IAsyncResult = .......

It doesn't make sense why i would have to do this..... i thought by adding event handling for async calls, Begin.... / End.... is obsolete

Can anyone provide an example / explanation?