title: C# check missing range from specified Range
body: <pre><code>a = 1-30
  b = 40-50
  c = 60-100
  </code></pre>
  
  <p>The range above is 1-100. This range miss 31-39. </p>
  
  <p>Does C# has a function that check whether specified range (1-100) missing any range (Ex:31-39) or missing value (Ex: 31)?</p>
  
  <p>Regards</p>