HttpClient is not found in .NET 4.5

.net, .net-4.5, asynchronous, c#, httpclient

Solution

Add a reference to `System.Net.Http`:

Problem

I am trying to use the new `HttpClient` in .NET 4.5, but Visual Studio complains that it doesn't exist. I have `System.Net`, but when I type `System.Net.Http`, it complains for that too. Am I supposed to download a new distributable for this class?

Original source