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POAsynchronous Programming with Async and Await
 

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    <p>I'm walking through this tutorial on how to program asynchronously in c# and have come across an error I'm not sure how to resolve. Here's the link: <a href="http://msdn.microsoft.com/en-us/library/hh191443.aspx">http://msdn.microsoft.com/en-us/library/hh191443.aspx</a> and the error is: </p> <pre><code>Cannot find all types required by the 'async' modifier. Are you targeting the wrong framework version, or missing a reference to an assembly? </code></pre> <p>I am targeting the .NET 4.0 framework and am unsure as to any additional assemblies required. </p> <p>Here is the code:</p> <pre><code>public async Task&lt;string&gt; AccessTheWebAsync(Class1 class1, Class2 class2) { // GetStringAsync returns a Task&lt;string&gt;. That means that when you await the // task you'll get a List&lt;string&gt; (urlContents). Task&lt;string[]&gt; listTask = GetList(class1); // send message task // You can do work here that doesn't rely on the string from GetStringAsync. //CompareService(); // The await operator suspends AccessTheWebAsync. // - AccessTheWebAsync can't continue until getStringTask is complete. // - Meanwhile, control returns to the caller of AccessTheWebAsync. // - Control resumes here when getStringTask is complete. // - The await operator then retrieves the string result from getStringTask. string[] listContents = await listTask; // The return statement specifies an integer result. // Any methods that are awaiting AccessTheWebAsync retrieve the length value. return listContents; } public Task&lt;string[]&gt; GetList(Class1 class1) { var taskArray = Task&lt;string[]&gt;.Factory.StartNew(() =&gt; GenerateResults(class1)); return taskArray; } public string[] GenerateResults(Class1 class1) { string[] results = new string[2]; results[1] = ""; results[2] = ""; return results; } </code></pre>
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    1. COasync - await is from .NET framework 4.5, not 4
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    2. CO@CuongLe, `async/await` is from `C#-5.0` but I use it in .NET 4.0 having installed `Async CTP` b/c I cannot install .NET-4.5 (or VS2012) on Windows XP (VS2010). Think about it as extension to true .NET-4.0, not the one coming with .NET-4.5 only
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