HighestBitSet in C#

I'm trying to optimize a a method that returns the highest bit set in a bit pattern, my current code is :

 private int HighestBitSet(int bitPattern)
 {
 return 
 (Convert.ToString(bitPattern, 2).Length - 1)
 - 
 Convert.ToString(bitPattern, 2).IndexOf("1");
 }

I know that in c++ i can use an assembler intruction to do this but in c# is not possible so, how can i optimize this

Tnks

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HighestBitSet in C#

gbm1
I have already found an answer in this site tnks anyway...
HighestBitSet in C#

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