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There are a few preliminary sources that mention that there is a new ValueTask in C# 7.0:
https://blogs.msdn.microsoft.com/dotnet/2016/08/24/whats-new-in-csharp-7-0/
http://intellitect.com/generalized-async-return-types/
But I am not able to find this type?
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Use Task when you have a piece of code that will always be asynchronous, i.e., when the operation will not immediately complete. Take advantage of ValueTask when the result of an asynchronous operation is already available or when you already have a cached result.
An instance created with the parameterless constructor or by the default(ValueTask<TResult>) syntax (a zero-initialized structure) represents a synchronously, successfully completed operation with a result of default(TResult) .
A ValueTask is a struct that wraps either the result, or the Task returned from an async method. This is extremely helpful in scenarios where the method can return either synchronously or asynchronously. The ValueTask will return just the value in the synchronous code path, or the Task in the asynchronous code path.
In many scenarios, it is useful to enable a Task<TResult> to represent an external asynchronous operation. TaskCompletionSource<TResult> is provided for this purpose. It enables the creation of a task that can be handed out to consumers.
According to the documentation, System.Threading.Tasks.ValueTask<TResult> is in the System.Threading.Tasks.Extensions package.
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