title: what does ":" after parameter name means?
body: <p>I have a c# method:</p>
  
  <pre><code>public void foo (DateTime toDate) { ... }
  </code></pre>
  
  <p>when I invoke that method, visual studio intellisense suggest an option of</p>
  
  <pre><code>foo (toDate :    )
  </code></pre>
  
  <p>What does that syntax mean ? sending anonymous var ?</p>
  
  <p>Thanks for any clarification  </p>