title: Searching if value exists in a list of objects using Linq
body: <p>Say I have a class <code>Customer</code> which has a property <code>FirstName</code>. Then I have a <code>List&lt;Customer&gt;</code>.</p>
  
  <p>Can LINQ be used to find if the list has a customer with <code>Firstname = 'John'</code> in a single statement.. how?</p>