How to perform multiplication, using bitwise operators?

Question

I am working through a problem which i was able to solve, all but for the last piece - i am not sure how can one do multiplication using bitwise operators:

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Answer 1

I have just realized that this is the same answer as the previous one. LOL sorry.

public static uint Multiply(uint a, uint b)
{
   uint c = 0;
   while(b > 0)
   {
      c += ((b & 1) > 0) ? a : 0;
      a <<= 1;
      b >>= 1;
   }
   return c;
}