Web.config setup to target 4.5 for correct C# with Example



Web.config setup to target 4.5 for correct C# with Example

async behaviour 
The web.config system.web.httpRuntime must target 4.5 to ensure the thread will renter the request context before 
resuming your async method. 
 
Async and await have undefined behavior on ASP.NET prior to 4.5. Async / await will resume on an arbitrary thread 
that may not have the request context. Applications under load will randomly fail with null reference exceptions 
accessing the HttpContext after the await. Using HttpContext.Current in WebApi is dangerous because of async 

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