title: Member 'object.Equals(object, object)' cannot be accessed with an instance reference; qualify it with a type name instead
body: <p>When I used the following code in C#...</p>
  
  <pre><code>int totalValue = 0;
  int total = 0;
  totalValue = int.Parse(Session["price"].ToString()) * int.Parse(Session["day"].ToString());
  
  // This line causes the error
  totalValue += Session["IsChauffeurUsed"].ToString().Equals("Yes", StringComparer.CurrentCultureIgnoreCase) ? 80 : 0;
  </code></pre>
  
  <p>... I received this error :</p>
  
  <blockquote>
    <p>Member 'object.Equals(object, object)' cannot be accessed with an instance reference; qualify it with a type name instead.</p>
  </blockquote>
  
  <p>What does that error indicate?</p>