title: How to correctly deal with System.Nullable<T> fields of LinqToSql classes?
body: <p>I've got a table with some nullable double fields. Working with LinqToSQL trying to use the field directly I get</p>
  
  <blockquote>
    <p>Argument type System.Nullable is not assignable to parameter type double</p>
  </blockquote>
  
  <p>How do I deal with this correctly?</p>