 <p>Your method Test is defined as taking a parameter of <code>Func&lt;bool&gt;</code> which expects a method signature similar to <code>bool Something();</code></p> <p>Look at the other <code>Func&lt;&gt;</code> options to see which match what you're trying to accomplish. At the very least you're looking at either <a href="http://msdn.microsoft.com/en-us/library/018hxwa8.aspx" rel="nofollow"><code>Action&lt;string&gt;</code></a> or <a href="http://msdn.microsoft.com/en-us/library/bb549151.aspx" rel="nofollow"><code>Func&lt;bool, string&gt;</code></a></p>