title: How do you set a double value to a "non-value"
body: <p>I have two double data elements in an object.</p>
  
  <p>Sometimes they are set with a proper value and sometimes not. When the form field from which they values are received is not filled I want to set them to some value that tells me, during the rest of the code that the form fields were left empty. </p>
  
  <p>I can't set the values to null as that gives an error, is there some way I can make them 'Undefined'.</p>
  
  <p>PS. Not only am I not sure that this is possible, it might not also make sense. But if there is some best practice for such a situation I would be keen to hear it.</p>