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Home/ Questions/Q 505175
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T06:34:18+00:00 2026-05-13T06:34:18+00:00

I am consuming a 3rd-party web service which has been implemented in WCF. My

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I am consuming a 3rd-party web service which has been implemented in WCF.

My consumer code resides on an ASP.NET asynchronous page.

Problem is, sometimes the BeginCallWebService() method is returning null. Shouldn’t it always return an IAsyncResult object?

Should I ask the web service developer to modify their code, or is null a legit response?

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  1. Editorial Team
    Editorial Team
    2026-05-13T06:34:18+00:00Added an answer on May 13, 2026 at 6:34 am

    Begin... should always return IAsyncResult as you’ll need it to call End...

    Currently his webservice implements async patterns (his bug), or your proxy provide it (your bug)?

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