vb.net Callbacks

I have this documentation for an Async method...
SearchAsync method

Parameter        Description

callback             The delegate to call once a response has been received.
searchTerm      Free-text search filter.
category            Optional category of item to get.

How do I write a callback in vb.net ?

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Guy Hengel [angelIII / a3]Billing EngineerCommented:
DodsworthAuthor Commented:
I'm a bit confused.
If callback is a parameter, shouldn't it show up in the intellisense box ?
Guy Hengel [angelIII / a3]Billing EngineerCommented:
>shouldn't it show up in the intellisense box ?
in what regards? the functions to pass? please clarify
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DodsworthAuthor Commented:
When I type "SearchAsync(" a box pops up showing "<Awaitable> Public Function SearchAsync([searchterm as String = Nothing], [category as Nokia.Music.Types.Category?=Nothing])

But there is no placeholder for the callback parameter.
Guy Hengel [angelIII / a3]Billing EngineerCommented:
possibly then either the documentation is wrong...
note: I don't use VB.net regularly, so I don't know about any special cases for the intellisense there, as callback functions is something I use very rarely.

the important point is compiling: can you specify the 3 parameters (the first one using AddressOf some_function style) or not?
DodsworthAuthor Commented:
Won't compile :(  Does that suggest the documentation is incorrect or could there be some inconsistency between C# and VB.net ?
Guy Hengel [angelIII / a3]Billing EngineerCommented:
I would say so...
DodsworthAuthor Commented:
So how to tell when an awaited function completes if the API has no built in mechanism to do so ?
Guy Hengel [angelIII / a3]Billing EngineerCommented:
that is the most unwanted answer;
not possible

however, I presume it's rather a bug in the function declaration, I would check with the API provider about this issue.

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Visual Basic.NET

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