title: Adding a single item to a ListView in Xamarin.iOS
body: <p>I have a Xamarin.iOS application with a ListView in a .xaml file that originally populates with around 4000 items (potentially more) from a DB at startup.</p>
  
  <pre><code>&lt;ListView x:Name="listView"&gt;&lt;/ListView&gt;
  </code></pre>
  
  <p>The user will make entries in another page of the application while it's open, so I want to add a function in the .xaml.cs file to update the ListView with only that entry so the other 4000 entries don't have to be accessed again.</p>
  
  <p>Setting all the items in a ListView with a <code>string[]</code> or <code>List&lt;string&gt;</code> is simple with <code>listView.ItemsSource = myStringArray;</code>; however, I can't seem to figure out how to add a single item (string) into the ListView. Some answers include using an <code>ArrayAdaptor&lt;string&gt;</code> but this is only for Xamarin.Android. How can I add one string into a ListView in Xamarin.iOS?</p>