HttpClient lives in the System.Net.Http namespace.
You’ll need to add:
using System.Net.Http;
And make sure you are referencing System.Net.Http.dll in .NET 4.5.
The code posted doesn’t appear to do anything with webClient. Is there something wrong with the code that is actually compiling using HttpWebRequest?
Update
To open the Add Reference dialog right-click on your project in Solution Explorer and select Add Reference…. It should look something like:
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