BinaryGap algortihm Codility

BinaryGap.cs

public int solution(int N)
{
    if (N < 5) return 0;

    var bits = Convert.ToString(N, 2).Length;

    int result = 0;
    int gap = 0;
    bool canCount = false;

    while (bits > 0)
    {
        if ((N & 1) == 1)
        {
            result = Math.Max(result, gap);
            gap = 0;
            canCount = true;
        }
        else
        {
            if (canCount) ++gap;
        }

        N >>= 1;
        --bits;
    }

    return result;
}