A fast hash function for string in C#

Question

I want to hash a string of length up-to 30. What will be the best idea to do that if time is my concern. The function will be called over 100 million times. currently I am using the following code,

static UInt64 CalculateHash(string read, bool lowTolerance) {     UInt64 hashedValue = 0;     int i = 0;     while (i < read.Length)     {         hashedValue += read.ElementAt(i) * (UInt64)Math.Pow(31, i);         if (lowTolerance) i += 2;         else i++;     }     return hashedValue; } 

Answer 1

static UInt64 CalculateHash(string read) {     UInt64 hashedValue = 3074457345618258791ul;     for(int i=0; i<read.Length; i++)     {         hashedValue += read[i];         hashedValue *= 3074457345618258799ul;     }     return hashedValue; } 

This is a Knuth hash. You can also use Jenkins.