Multiplication of the two numbers without using * operator in C#

Multiplication of the two numbers without using * operator in C#.
try this code:

 
static int Multiply(int a, int b)
        {
            if (a == 0 || b == 0)
            {
                return 0;

            }
            else
            {
                int sum = 0;
                for (int i = 0; i < b; i++)
                {
                    sum += a;
                }
                return sum;
            }
        }