title: C# 4.0 How to get 64 bit hash code of given string
body: <p>I want to get 64 bit hash code of given string. How can i do that with fastest way ?
  There is a ready method for get 32 bit hash code but i need 64 bit. </p>
  
  <p>I am looking for only integer hashing. Not md5. </p>
  
  <p>Thank you very much.</p>
  
  <p>C# 4.0</p>