The type or namespace name "WebRequestHandler" could not be found : <p>I am trying to use the Dropbox.API code that is listed here:</p>

<p><a href="https://github.com/dropbox/dropbox-sdk-dotnet/tree/master/dropbox-sdk-dotnet/Examples/SimpleTest" rel="noreferrer">https://github.com/dropbox/dropbox-sdk-dotnet/tree/master/dropbox-sdk-dotnet/Examples/SimpleTest</a></p>

<p>I copied their Program.cs into my Program.cs without making other changes to other files in my solution/project.</p>

<p>I am getting </p>

<pre><code>The type or namespace name "WebRequestHandler" could not be found.
</code></pre>

<p><a href="https://i.stack.imgur.com/2NQQl.png" rel="noreferrer"><img src="https://i.stack.imgur.com/2NQQl.png" alt="enter image description here"></a></p>

<p>Despite having this using statement:</p>

<pre><code>using System.Net.Http;
</code></pre>

<p>The help text says to add an assembly reference, but I don't know what I would add.</p>

<p>I tried moving the <code>using System.Net.Http</code> to both inside and outside the class.</p>

<p>I am new to C# and .Net development so expect this to be a really newbie problem.</p>
