I'm new to C#, and I'm trying to convert this code from java into C#.

    static public double euclidean_2(double[] x, double[] y)
    {
        if (x.length != y.length) throw new RuntimeException("Arguments must have same number of dimensions.");

        double cumssq = 0.0;
        for (int i = 0; i < x.length; i++)
            cumssq += (x[i] - y[i]) * (x[i] - y[i]);

        return cumssq;
    }

I know java uses .length but what is the equivalent in C# since I keep getting an error

Thanks