title: Calculate difference of elements in array
body: <p>Is there a way to calculate the difference between elements in an array and check if difference is > 1 using LINQ?</p>
  
  <p>So if you have an array {1,2,3,5,8,9}, want to know what the difference is between each of the elements and only get the elements that follow each up directly, so difference == 1.</p>
  
  <p>Is this possible using LINQ?</p>