title: Getting "The best overloaded method match for double.Parse(string) has some invalid arguments" error
body: <p>With this kind of code</p>
  
  <pre><code>double socialSecurityFee = 0;
  double xsocialSecurityFee = double.Parse (socialSecurityFee);
  </code></pre>
  
  <p>I get this kind of error</p>
  
  <blockquote>
    <p>Error CS1502: The best overloaded method match for
    `double.Parse(string)' has some invalid arguments (CS1502)
    (socialSecurityFee)</p>
  </blockquote>
  
  <p>What's wrong with my code?</p>