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    <p>Servy is correct in saying you shouldn't block the UI with synchronous calls. </p> <p>With that being said, I had a similar requirement in a WP7 app. I used "Async CTP" to add the ability to write synchronous like functions that wait until it's done before making the next call. I had API calls that required data from earlier calls to function correctly. </p> <p>I believe this was included in .NET 4.5 and works on WP8. </p> <p><a href="http://msdn.microsoft.com/en-ca/library/vstudio/hh191443.aspx" rel="nofollow">http://msdn.microsoft.com/en-ca/library/vstudio/hh191443.aspx</a></p> <p>Here is what I wrote to pull data for my app (Notice the "<strong>async</strong>" and "<strong>await</strong>" keywords):</p> <pre><code>public async Task&lt;bool&gt; GetDefaultData() { try { _cancellation = new CancellationTokenSource(); UpdateProgress(DateTime.Now + ": Download Started.\n"); List&lt;string&gt; data = await App._apiConnection.DoWorkAsync(_cancellation.Token, ApiInfo.GetBaseDataUriList()); App._apiConnection.Done(data); UpdateProgress(DateTime.Now + ": Countries: " + App._context.Countries.Count() + "\n"); UpdateProgress(DateTime.Now + ": Regions: " + App._context.Regions.Count() + "\n"); UpdateProgress(DateTime.Now + ": Income Levels: " + App._context.IncomeLevels.Count() + "\n"); UpdateProgress(DateTime.Now + ": Indicators: " + App._context.Indicators.Count() + "\n"); data = await App._apiConnection.DoWorkAsync(_cancellation.Token, ApiInfo.GetCountryUriList("CA")); App._apiConnection.Done(data); UpdateProgress(DateTime.Now + ": CA Population: " + App._context.PopulationDatas.Count(c =&gt; c.Country.Iso2Code == "CA") + "\n"); data = await App._apiConnection.DoWorkAsync(_cancellation.Token, ApiInfo.GetCountryUriList("US")); App._apiConnection.Done(data); UpdateProgress(DateTime.Now + ": US Population: " + App._context.PopulationDatas.Count(c =&gt; c.Country.Iso2Code == "US") + "\n"); data = await App._apiConnection.DoWorkAsync(_cancellation.Token, ApiInfo.GetCountryUriList("CN")); App._apiConnection.Done(data); UpdateProgress(DateTime.Now + ": CN Population: " + App._context.PopulationDatas.Count(c =&gt; c.Country.Iso2Code == "CN") + "\n"); return true; } catch (OperationCanceledException) { MessageBox.Show("Operation Cancelled"); return false; } catch (Exception ex) { MessageBox.Show("getDefaultData Exception: " + ex.Message); return false; } } </code></pre>
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    1. POBetter way to load image synchronously on Windows Phone?
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    1. USAdam Benoit
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      1. VTUpMod
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    1. COcheers mate, i'm now working for a WP7.5 project whose Async CTP has bugs that won't let me to install it. I'll try Async CTP later when the project is moved to WP8. Thanks.
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    2. COI had that problem. I uninstalled all hotfixes then reinstalled VS2010, the Service Pack THEN the Async CTP. then I reapplied all the hotfixes. Then it worked like a champ for me. Hope this helps!
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      1. USAdam Benoit
    3. COYeah, thanks for the advice. I did some search about this issue and found a similar solution to you. But I'm now under Windows 8 :-[
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