title: fastest code to generate unique base62 hashes
body: <p>hey guys i want to generate unique base62 hashes - something similar to what tinyurl and bit.ly do using c#. this would be based on an auto increment field ID of type bigint (like most of these sites)</p>
  
  <p>min chars would be 1 and max chars would be 6... if you had to write the fastest code (least amount of cpu usage) in c# for this hash how would you write it?</p>